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Children's Dictionary
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ache to hurt with a dull, constant pain. [3 definitions]
achieve to do or carry out successfully; accomplish. [2 definitions]
achievement something achieved through hard work, courage, or skill. [2 definitions]
acid a chemical substance that dissolves in water, has a sour taste, and turns blue litmus paper red. [4 definitions]
acid rain rain that contains acid from pollution.
acknowledge to admit the truth or existence of. [3 definitions]
acknowledgment the act of acknowledging. [2 definitions]
acne a skin condition that makes pimples appear on the face, back, or chest. It happens when oil glands in the skin are blocked.
acorn the nut 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.
across from one side to the other of. [5 definitions]