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abbreviation a shortened form of a word or phrase used in writing.
addend a number or amount added to another to form a sum.
aerobics (used with a singular or plural verb) a form of exercise that works the heart and lungs to help the body use oxygen better. Running, swimming, biking, or dance are forms of aerobics.
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 algae. "Algae" is a plural noun; the singular form is "alga."
algebra a form of mathematics used to solve problems in which some of the numbers are not known. In an algebra problem, letters stand for the unknown numbers.
am a form of the verb be that is present tense and used with the pronoun "I."
arcade a row of arches connected to form a passageway. [1/2 definitions]
arch1 to form an arch or curve in. [2/4 definitions]
are1 a form of the verb be that is present tense and used with the pronouns "you," "we," or "they." It is also used with plural nouns.
aren't shortened form of "are not" and of "am not."
assembly a collection of parts put together to form a whole, as in a machine. [2/4 definitions]
bacterium singular form of bacteria.
ballet a form of dance that uses exact, graceful movements. [1/2 definitions]
bangle a bracelet in the form of a solid ring.
bank1 to form into a pile. [1/3 definitions]
bend to cause to take on a curved or angled form, or a different form. [2/5 definitions]
beryllium a hard, light, gray substance that is one of the chemical elements. Beryllium is sometimes combined with other elements to form an alloy. It is also used in building rockets. (symbol: Be)
Big Dipper part of the constellation Ursa Major, made up of this constellation's seven brightest stars. These stars form a shape that looks like a ladle, or dipper.
bike (informal) a short form of bicycle or motorcycle. [1/2 definitions]
bill2 the parts of a bird's jaw that form the beak.
black hole a region or body in space with gravity so strong that neither light nor matter can escape it. Scientists believe that black holes form when very large stars collapse.