| 1801 | insomnia | Insomnia is a condition in which a person has difficulty sleeping. |
| 1802 | inspect | To inspect is to look at something carefully. |
| 1803 | inspire | To inspire is to encourage someone by making them feel confident and eager to do something. |
| 1804 | instance | An instance is an example of something. |
| 1805 | instant | An instant is a very short amount of time. |
| 1806 | instead | Instead means in place of. |
| 1807 | institute | An institute is an organization that is interested in research or teaching. |
| 1808 | institution | An institution is an organization that works to help a city or group of people. |
| 1809 | instruct | To instruct is to teach. |
| 1810 | instructions | A set of instructions explains how to do something. |
| 1811 | instrument | An instrument is something designed to do a certain task like play music. |
| 1812 | insulate | To insulate something means to protect it from heat, cold, or noise. |
| 1813 | insult | To insult someone is to say things that will hurt the person’s feelings. |
| 1814 | intact | When something is intact, it is complete and not damaged. |
| 1815 | intake | Your intake of food is the amount of food you take into your body. |
| 1816 | integral | Something that is integral is an important part of the whole. |
| 1817 | integrate | To integrate is to make something a part of another larger thing. |
| 1818 | integrity | Integrity is honesty and good morals. |
| 1819 | intellect | An intellect is a person’s ability to understand things easily. |
| 1820 | intellectual | An intellectual is a very smart person. |
| 1821 | intelligence | Intelligence is the ability to learn and understand things. |
| 1822 | intelligent | If someone is intelligent, they are very smart. |
| 1823 | intend | To intend to do something means to plan to do it. |
| 1824 | intense | An intense thing is very strong. |
| 1825 | intent | An intent is a plan to do something. |
| 1826 | intention | An intention is what a person plans to do. |
| 1827 | interact | To interact is to talk to or do something with another person. |
| 1828 | interchange | An interchange of ideas between people is a discussion of each person’s idea. |
| 1829 | interfere | To interfere is to cause problems and keep something from happening. |
| 1830 | interior | An interior is the inside of something. |
| 1831 | internal | When something is internal, it exists or happens inside a person, object, or place. |
| 1832 | international | If something is international, it involves more than one country. |
| 1833 | interpret | When you interpret something, you find its meaning, often by changing it into a different language. |
| 1834 | interval | An interval is the time between two things happening. |
| 1835 | intervene | To intervene means to help stop a problem between two people or groups. |
| 1836 | intestines | Intestines are tubes through which food passes after it leaves the stomach. |
| 1837 | intimate | When a relationship is intimate, the two things are very closely connected. |
| 1838 | intimidate | To intimidate means to frighten others. |
| 1839 | intrigue | To intrigue means to cause an interest in something or someone. |
| 1840 | intrinsic | If something is intrinsic, then it is related to the basic nature of that thing. |
| 1841 | intuitive | Intuitive is knowing about something without having support or proof. |
| 1842 | invade | To invade is to take over a place by force. |
| 1843 | invalid | If something is invalid, it is not correct. |
| 1844 | invasion | An invasion is an attack by a group from another country. |
| 1845 | invent | To invent is to create something that never existed before. |
| 1846 | inventive | When someone is inventive, they are good at creating new things. |
| 1847 | inventory | An inventory is a supply of something. |
| 1848 | invest | To invest means to use money in a way that will bring a profit later. |
| 1849 | investigate | To investigate means to search for something or learn about it. |
| 1850 | invite | To invite is to ask someone to come to a place or event. |
| 1851 | invoke | To invoke something is to mention it to support an argument or ask for help. |
| 1852 | involve | To involve means to include as an active participant. |
| 1853 | inward | If a thought or feeling is inward, it is not expressed or shown to others. |
| 1854 | iron | Iron is a strong metal that is used to make many objects. |
| 1855 | irrigate | To irrigate means to supply water to land so that crops can grow. |
| 1856 | irritable | When someone is irritable, they become annoyed or angry very easily. |
| 1857 | irritate | To irritate means to annoy someone. |
| 1858 | island | An island is land in the middle of water. |
| 1859 | isolate | To isolate is to separate one person or thing from a group. |
| 1860 | issue | An issue is an important topic. |
| 1861 | itch | To itch means to have an unpleasant feeling that you want to scratch. |
| 1862 | item | An item is a single separate piece. |
| 1863 | ivory | Ivory is a hard, white substance that comes from elephants. |
| 1864 | jagged | When something is jagged, it has a tough, uneven shape or edge. |
| 1865 | jail | A jail is a place to keep bad people. |
| 1866 | janitor | A janitor is a person who makes repairs and takes care of a building. |
| 1867 | jealous | A jealous person might take something from you. |
| 1868 | jealousy | Jealousy is a feeling of wanting something that somebody else has. |
| 1869 | jet | A jet is a fast plane with a big engine. |
| 1870 | jewel | A jewel is a beautiful stone that is worth a lot of money. |
| 1871 | job | Your job is the work you do to earn money. |
| 1872 | jog | To jog is to run slowly. |
| 1873 | joint | When something is joint, it is done by or involves two or more people or groups. |
| 1874 | journal | A journal is a type of magazine that deals with an academic subject. |
| 1875 | journalism | Journalism is the work of collecting the news to put in newspapers or on TV. |
| 1876 | journalist | A journalist is a person who writes news stories. |
| 1877 | journey | A journey is a long trip. |
| 1878 | joy | Joy is a feeling of great happiness. |
| 1879 | judge | To judge something is to say if it is good or bad. |
| 1880 | jungle | A jungle is a type of forest in a warm, rainy tropical area, where trees and plants grow very close together. |
| 1881 | junior | A junior person is younger or less experienced. |
| 1882 | jurisdiction | Jurisdiction means the power or right to make judgments about the law and how it is upheld. |
| 1883 | jury | A jury is a group of people that listen to a trial and say if someone is guilty. |
| 1884 | justice | Justice is fairness in the way that people are treated. |
| 1885 | justify | To justify something means to show or prove that it is necessary. |
| 1886 | justly | If something is done justly, then it is fair. |
| 1887 | keen | If someone is keen, they are intelligent. |
| 1888 | keep | To keep is to stay in a particular state, condition, or position. |
| 1889 | kerosene | Kerosene is a type of oil used in some lamps and stoves. |
| 1890 | kettle | A kettle is a large metal pot used for boiling liquids or cooking food. |
| 1891 | key | When something is key, it is extremely important. |
| 1892 | keyboard | A keyboard has buttons marked with letters and numbers that are pressed to put information into a computer. |
| 1893 | kid | To kid is to say something that is not true as a joke. |
| 1894 | kidnap | To kidnap someone is to take that person illegally. |
| 1895 | kill | To kill someone or something is to make them die. |
| 1896 | kilometer | A kilometer is a unit of measurement that is 1,000 meters. |
| 1897 | kin | Kin is a person’s family and relatives. |
| 1898 | kit | A kit is a set of all the things needed to do something. |
| 1899 | kneel | To kneel is to put one or both knees on the ground. |
| 1900 | knight | A knight is a soldier of high rank and skill who usually serves a king. |
| 1901 | knowledge | Knowledge is what you know. |
| 1902 | known | If something is known, it is something that people are aware of or have discovered. |
| 1903 | label | A label is a tag that tells about something. |
| 1904 | labor | Labor is the act of doing or making something. |
| 1905 | laboratory | A laboratory is a room where a scientist works. |
| 1906 | lack | If there is a lack of something, there is not enough of it. |
| 1907 | ladder | A ladder is an object that is used to climb up and down things. |
| 1908 | lag | To lag behind is to move slowly behind other moving objects. |
| 1909 | lame | If one is lame, they cannot walk properly due to an injury to the leg or foot. |
| 1910 | landing | A landing is when you return to the ground or another surface after a flight or a boat ride. |
| 1911 | landlord | A landlord is a man who rents property to a person. |
| 1912 | landmark | A landmark is an object that helps people find or remember a location. |
| 1913 | landscape | A landscape is how an area of land looks. |
| 1914 | language | A language is a system of communication. |
| 1915 | large | Something large is very big. |
| 1916 | later | Later means after the present, expected, or usual time. |
| 1917 | latitude | The latitude of a place is its distance from the equator. |
| 1918 | latter | Latter describes something last in a series or the second choice of two things. |
| 1919 | laugh | Laugh is the sound made when someone is happy or a funny thing occurs. |
| 1920 | laughter | Laughter is the sound produced by laughing about something funny. |
| 1921 | launch | To launch something means to make it go into motion. |
| 1922 | laundry | Laundry is clothes that have been or need to be washed. |
| 1923 | lava | Lava is the hot substance made of melted rock that comes out of volcanoes. |
| 1924 | law | A law is a rule made by the legislative body. |
| 1925 | lawn | A lawn is an area covered in grass. |
| 1926 | lawyer | A lawyer works with the law and represents people in court. |
| 1927 | lay | To lay means to put or place in a horizontal or flat position. |
| 1928 | layer | A layer covers over something or is one of several pieces lying on top of each other. |
| 1929 | lead | When you lead something, you go first and it follows you. |
| 1930 | leading | When something is leading, it is the most advanced or best. |
| 1931 | lean | To lean is to bend in a particular direction. |
| 1932 | leap | To leap means to jump a long distance. |
| 1933 | lease | To lease means to rent property, usually an apartment or land. |
| 1934 | leash | A leash is a rope or chain that is used to lead an animal. |
| 1935 | leather | Leather is a material made from animal skin that is used to make clothing. |
| 1936 | leave | To leave means to go away from someone or something. |
| 1937 | lecture | A lecture is a long, educational speech. |
| 1938 | leg | A leg is a body part used for standing and walking. |
| 1939 | legacy | A legacy is an effect that exists because of a person or thing in the past. |
| 1940 | legal | If something is legal, it is related to the law or allowed by the law. |
| 1941 | legend | A legend is a story from the past. |
| 1942 | legislate | To legislate means to make laws. |
| 1943 | legislature | A legislature is the section of a government that makes laws. |
| 1944 | legitimate | If something is legitimate, then it is acceptable according to the law. |
| 1945 | lend | To lend something is to give it to someone for a short time. |
| 1946 | length | The length of something is how long it is from one end to the other. |
| 1947 | lentil | Lentils are very small beans that people cook and eat. |
| 1948 | level | A level is a point on a scale that measures something. |
| 1949 | liable | If something is liable to happen, it is very likely that it will happen. |
| 1950 | liberty | Liberty is freedom to do what one wants. |
| 1951 | library | A library is a place where you go to read books. |
| 1952 | license | A license is an official document that gives one permission to do something. |
| 1953 | lick | When you lick something, you pass your tongue over it. |
| 1954 | lie | To lie is to say or write something untrue to deceive someone. |
| 1955 | lieutenant | A lieutenant is a rank in the military or police, or a person with that rank. |
| 1956 | life | Life is the time when a person is alive. |
| 1957 | lift | To lift something is to move it higher. |
| 1958 | light | Light is a form of energy or brightness that makes it possible to see something. |
| 1959 | lightly | To do something lightly is to not push very hard. |
| 1960 | lightning | Lightning is the bright light seen during a storm. |
| 1961 | likewise | If someone does something likewise, they do the same thing as someone else. |
| 1962 | limb | A limb is a large branch on a tree. |
| 1963 | limit | A limit is the largest or smallest amount of something that you allow. |
| 1964 | limp | To limp means to walk with difficulty because someone’s leg or foot is hurt. |
| 1965 | line | A line is a row of people or things. |
| 1966 | linger | To linger is to last for a long time. |
| 1967 | linguistic | If something is linguistic, then it is concerned with language. |
| 1968 | link | A link is a connection to something else. |
| 1969 | lion | A lion is a large animal in the cat family. |
| 1970 | liquid | A liquid is a substance that is neither solid nor gas. |
| 1971 | list | A list is a record of information printed with an item on each line. |
| 1972 | listen | To listen is to pay attention to a sound that you can hear. |
| 1973 | literary | A literary person or thing is involved with literature in some way. |
| 1974 | literature | Literature is books, plays, and poetry. |
| 1975 | lively | If someone is lively, they have a lot of energy. |
| 1976 | liver | The liver is a large organ in the body that produces bile and cleans blood. |
| 1977 | load | To load is to put objects into something. |
| 1978 | loaf | A loaf of bread is bread shaped and baked in one piece. |
| 1979 | loan | A loan is something, usually money, that one person lends to another. |
| 1980 | local | If something is local, it is nearby. |
| 1981 | locale | A locale is a small area or place where something specific happens. |
| 1982 | locate | To locate something is to find it. |
| 1983 | lodge | A lodge is a house in the mountains used by people who hunt or fish. |
| 1984 | log | A log is a thick piece of wood that is cut from a tree. |
| 1985 | lone | A lone person or thing is the only one in a given place. |
| 1986 | loneliness | Loneliness is the unhappiness that is felt by someone if they do not have any friends. |
| 1987 | longevity | Longevity is the ability to live for a long time. |
| 1988 | longing | A longing is a strong feeling of wanting. |
| 1989 | loop | A loop is a line made into the shape of a circle. |
| 1990 | loose | A loose thing is not held in place tightly. |
| 1991 | lose | To lose is to have something that is important or necessary taken from you or destroyed. |
| 1992 | loss | A loss is the act or instance of losing something. |
| 1993 | loud | If a sound is loud, it is strong and very easy to hear. |
| 1994 | love | To love is to like something or someone a lot. |
| 1995 | low | If something is low, it is smaller than usual in amount, number, or degree. |
| 1996 | lower | To lower something is to make it go down. |
| 1997 | loyal | Loyal people always help or support a certain person or thing. |
| 1998 | lump | A lump is a small piece of something that is solid. |
| 1999 | lunar | If something is lunar, then it is related to the moon. |
| 2000 | lung | A lung is a part of the body that fills with air when breathing. |