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about If a book is about trains, it means that the book tells you many things on the subject of trains. It might tell you things like where the first trains were built, what fuel trains use, or how fast trains travel. [1/9 definitions]
abundant If certain things are abundant, there are very many of them. There are more than enough. If there is an abundant amount of something, there is plenty of it.
ache If you have a dull pain in some part of your body and the pain lasts a long time, it means that that part of your body aches. If you have dull pain in many parts of your body, it means that you ache. [1/4 definitions]
acid An acid is a kind of chemical substance. When something has a lot of acid in it, like lemons, it tastes sour. We eat and drink many things that contain acid. A very strong acid can be dangerous, though. It can burn something that it touches. [1/2 definitions]
acrylic a kind of plastic used to make yarns, paint, and many other things.
Afghanistan Afghanistan is a country in Asia. It is in an area of the world called the Middle East. It is a country with many mountains, but other parts of the country are low and dry. Soccer is one of the favorite sports in Afghanistan, and rice with raisins and cooked carrots is a popular food.
Africa Africa is one of the seven largest areas of land on the earth. These areas of land are called continents. Africa is the second largest continent on our planet. Only Asia is bigger than Africa. Africa is made up of more than fifty different countries, and people speak many different languages in these countries. Some of the languages are Swahili, Hausa, and Arabic.
again and again many times.
aged being old or having lived many years. [1/3 definitions]
ain't "Ain't" is a short way to say "am not," "is not," "are not," "have not," or "has not." Some people think that using "ain't" is using English in the wrong way. Many teachers tell students not to write "ain't" in school assignments.
aisle An aisle is a long, open space where you can walk between many rows of seats. An aisle is also the area between long shelves in places like stores and libraries. You walk down the aisles and find the things you want to buy or look at.
alcohol Alcohol is a liquid often made from grain or fruit. Some drinks, such as beer and wine, have alcohol in them. Many adults enjoy the taste of alcohol in drinks, but alcohol can also make people feel and act differently from how they usually feel or act. Drinking some alcohol is usually OK for adults, but drinking a lot of alcohol can sometimes be bad. [1/2 definitions]
alga "Alga" is the singular form of the word "algae." Algae are living things that live mainly in water and make their food by using light from the sun. Algae are similar to plants, but they are not usually considered to be plants because they are different in some ways. For example, algae don't have roots and leaves like plants do. Most forms of algae are very helpful for animals and people. Seaweed is a kind of algae, which many people eat and can also be used in making other things. Fish and other water animals use algae for food.
algae organisms that live mainly in the water and make their food through photosynthesis. Algae are different from plants in that they have no true leaves, roots, or stems. Seaweeds are one form of algae, but there are many others, including a large number that cannot be seen without a microscope. "Algae" is the plural form of the word "alga."
alien a living being from another planet; extraterrestrial. There is no evidence that aliens exist, but many people believe there is life on other planets. [1/5 definitions]
all-around able to do many different things.
alligator a large reptile with short legs, a long body and tail, and a long, wide snout. Alligators are protected by thick skin with many hard bumps. They live in rivers, lakes, swamps, and other bodies of water in the southeast United States and in China. They usually eat insects, fish, turtles, snakes, birds, and other water animals, but have been known to attack small land mammals. They are closely related to crocodiles. Chinese alligators are endangered because their habitat is being changed by people.
all-purpose used in many different ways.
almanac a book of interesting and useful facts about many different subjects. [1/2 definitions]
amount An amount of something is how much there is or how many there are. [1/3 definitions]
ancestor An ancestor is a living thing from a very long time ago that is related to a living thing that is on the earth now. Over time, many changes occurred to the ancestor so that it developed into the living thing that it is now. [1/2 definitions]