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Children's Dictionary
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acorn the fruit of an oak tree.
acoustic having to do with sound or hearing. [2 definitions]
acoustics the aspects of a room or space that make sounds easy or difficult to hear (used with a plural verb).
acquaint to introduce or make familiar (usually followed by "with").
acquaintance a person one has met but does not know well. [2 definitions]
acquire to get or come to have as one's own.
acquit to free from a charge of breaking the law; declare not guilty.
acre a unit of area equal to 43,560 square feet, used to measure land. The acre is a standard unit of measurement in the United States and the United Kingdom.
acreage the number of acres in an area of land.
acrobat a person who can do physical acts that take balance and skill.
acrobatic having to do with acrobats or feats of balance and skill.
acronym a word formed by putting together the first letters or parts of a series of words in a longer phrase.
acrophobia a very strong fear of high places.
across from one side to the other of. [5 definitions]
acrylic a kind of plastic used to make yarns, paint, and many other things.
act a thing that is done; deed. [9 definitions]
action something that is done for a particular purpose. [6 definitions]
action verb a verb that shows its subject performing some action. "Run," "eat," "fly," and "sing" are examples of action verbs.
activate to cause action in or make active; start.
active always doing something; busy; full of energy. [2 definitions]
actively in a way that involves making an effort, taking action, or participating.