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abysm a vast, unmeasurable space; bottomless pit; abyss.
abysmal of vast extent; unmeasurable; extreme. [2 definitions]
abyss a vast, unmeasurable space; bottomless pit. [2 definitions]
-ac of, relating to, or resembling. [2 definitions]
AC1 abbreviation of "alternating current," electrical current that reverses direction at regular intervals. (Cf. "DC.")
Ac symbol of the chemical element actinium.
AC2 abbreviation of "athletic club," a club that provides athletic equipment and sports-related services to its members.
A/C abbreviation of "air conditioning," a system that circulates cooled and dehumidified air in a building, car, or other space.
ac- to; toward.
acacia any of several tropical trees of the mimosa family, some of which produce the commercially useful gum arabic. [2 definitions]
academe the academic environment or life.
academic of or concerning a school or university. [4 definitions]
academic freedom in educational institutions, the freedom of a teacher to teach, of a student to learn, and of both to discuss and hold opinions, esp. about social, political, and moral issues, without arbitrary interference or reprisals by school or public officials, organized groups, or the like.
academician one who belongs to an organization, such as an academy, that promotes learning. [2 definitions]
academicism in the arts, rigid adherence to accepted and traditional forms.
academy an institution of learning, often private or specialized. [2 definitions]
Academy Award an award given by the Academy of Motion Picture Arts and Sciences for achievement in motion picture production and performance, also called an Oscar.
Acadia a former French colony on the northeastern coast of Canada.
acanthus any of various Mediterranean plants with large, spiny leaves. [2 definitions]
a cappella without instrumental accompaniment, as choral singing.
Acapulco a port city on the Pacific coast of southern Mexico, known for its resorts and water sports.