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above	When something is higher than something else in number, amount, or level, we can say that it is above it. The number ten is above the number nine, for example. [1/4 definitions]
abuse	When you abuse something, you use it in a way that is wrong or bad. If people abuse pills, for example, they take them in a different way from how the doctor tells them to take them. This can be dangerous. [1/4 definitions]
accompany	If a person or group accompanies someone who is performing, they support them by playing or singing along with them. A band often accompanies a singer, for example. Even though the band plays along with the performer, the band is not the main focus of attention. The singer is. [1/3 definitions]
ace	An ace is a playing card that shows only one symbol in the middle. For example, a card that has just one heart in the middle, is an ace. [1/2 definitions]
AIDS	AIDS is a serious disease that stops the body from being able to protect itself from other diseases. AIDS is caused by a virus, and the disease can be spread from one person to another, through blood, for example.
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	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" is a plural word. The singular form is "alga."
already	"Already" sometimes means "from an earlier time." If you already have a spoon, for example, then you don't need a spoon now. If you already know something, then you don't need to learn that thing or hear about it now. If the soup for lunch is already made, then there is no reason to make soup now. [1/3 definitions]
alter	If somebody alters something, they make a change in it. If you alter your hairstyle, for example, you make a change in it. If something alters a person, it makes them different from how they were before. Getting older is something that alters people a lot. [1/2 definitions]
annual	We call something an "annual" thing when it has to do with one year. An annual salary, for example, is the whole amount of money that someone gets paid in one year. [1/3 definitions]
apparatus	An apparatus is a piece of equipment, machine, or group of machines designed to let people do some specific thing. If you want to swim deep underwater, for example, you would probably wear an apparatus designed to let you breathe.
approach	When something gets close to or nearly equal to something, we can say it approaches it. If the temperature is approaching one hundred degrees, for example, it means it is getting near one hundred degrees. It is almost equal to one hundred degrees now. [1/6 definitions]
arena	An arena is a special area where certain sports events take place. A boxing match, for example, takes place in an arena. Some types of performances, like circuses, also take place in an arena. [1/2 definitions]
as¹	for example; for instance. [1/7 definitions]
aspect	If two people are looking at the same thing from different aspects, they will see different things. For example, if one person looks at a horse from the front, they will see its head, if they look at it from the back, they will see its tail. An aspect is a point or direction from which you see or think about something. [1/2 definitions]
associative property	in addition and multiplication, the characteristic that allows you to add or multiply a group of numbers in any order and get the same answer. For example, in multiplication, (5 x 2) x 7 is equal to (7 x 2) x 5.
assumption	something that is supposed or believed without questioning. For example, if you ask someone whether she is allowed to watch TV during dinner, you have made an assumption that there is a TV in her house. Assumptions are ideas people have that are not based on proven facts. An assumption can be correct or incorrect. [1/2 definitions]
atmosphere	When we talk about the atmosphere of a place, we mean the kind of feeling that the place seems to have. The colors, the noises, and the way people are talking and acting with each other are some of the things that create the atmosphere of a place. An airport has a very different atmosphere from a library, for example. A library usually has a quiet and calm atmosphere. The atmosphere at an airport is often busy and excited. [1/2 definitions]
audition	An audition is a short performance that someone gives to just a few people to show how well they can act, dance, sing, or play an instrument. When someone does an audition, they hope that the people watching will choose them to be in their play, movie, or something like that. Sometimes people have to give an audition in order to be part of a musical group or to get into a special school. For example, if they want to get into a school of music or dance, they might have to give an audition.
autism	Autism is a certain problem with the mind. Autism develops in some children, and in these children it begins to show when they are very young. Autism continues in people even when they become adults, though. When a child has autism, they have problems with language and problems interacting with other people. Some children may seem as if they are not interested in other people at all. Some children with autism have difficulty learning language, and those who learn language well may have difficulty knowing how to use language with other people. They may talk about the same thing all the time, for example.
average	An average is a number. You get an average by adding two or more numbers together and then dividing the answer you get by the number of numbers that you added. For example, when you add three numbers together and then divide that answer by three, you get an average of all the numbers. If you add five and seven and three, you get fifteen for your answer. Then, when you divide fifteen by three, you get an average of five. [1/5 definitions]

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