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agent provocateur (French) a secret agent who incites other people to commit acts that will subject them to punishment or prosecution, or who incites others to acts of rebellion or subversion; troublemaker.
age of consent the age at which a person, usu. female, is legally considered to be competent to consent to sexual relations, used as a standard in determining whether statutory rape has occurred.
age of majority the age at which a person is granted by law the rights and responsibilities of an adult, such as liability under contract and the right to sue.
age-old as old as the ages; ancient.
ageratum any of various low-growing, cultivated American plants of the aster family, with violet-blue or white flowers.
aggie a playing marble made of, or made to resemble, agate.
agglomerate to gather into a heap or mass. [4 definitions]
agglutinant causing or producing a gluing or sticking together; adhesive. [2 definitions]
agglutinate to fuse or unite, as by glue. [4 definitions]
agglutination the act or process of gluing or sticking together, or causing to do so. [2 definitions]
aggrandize to increase in size or scope; enlarge; extend. [2 definitions]
aggravate to make worse. [2 definitions]
aggravating (informal) causing great annoyance or frustration.
aggregate a sum, combination, or composite of separable elements. [6 definitions]
aggregation the act of collecting or being collected into a whole or mass. [2 definitions]
aggress to initiate an attack or quarrel; be the aggressor.
aggression unprovoked hostile action against a country by another's military forces. [3 definitions]
aggressive characterized by hostility in action. [2 definitions]
aggressor a person, group, animal, or nation that starts aggression against another.
aggrieve to distress or bring grief to; cause to suffer. [2 definitions]
aghast filled with terror or consternation; shocked.