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alt.2 abbreviation of "altitude," the height of a given object or location above a specified base, such as sea level or earth, esp. the angular distance of a celestial body, measured from the horizon.
Altaic a family of languages that includes Turkic, Mongolian, Tungusic, and Korean. [3 definitions]
Altai Mountains a central Asian mountain range that extends from western Mongolia into Russia and China.
Altair the brightest star in the constellation Aquila, having a magnitude of 0.8.
altar a raised structure, often a table or platform, upon or at which sacrifices or other religious ceremonies are performed.
altar boy one who assists the clergy in religious services; acolyte.
altarpiece a work of art that decorates the area above and behind an altar.
alter to make different; change. [2 definitions]
alterable capable of being changed or altered.
alterant resulting in or producing alteration. [2 definitions]
alteration the state or process of altering. [3 definitions]
alterative tending to alter or cause alteration.
altercate to argue heatedly; quarrel.
altercation a loud or angry argument or quarrel.
alter ego a second self or another aspect of oneself. [2 definitions]
alternate to continuously rotate or take turns with one another (usu. fol. by with). [9 definitions]
alternate angles a pair of nonadjacent angles that are formed on opposite sides of a line where it crosses two others transversely.
alternating current electrical current that reverses direction at regular intervals. (Cf. direct current.)
alternation the act or process of alternating. [2 definitions]
alternative one of two or more possibilities; option. [5 definitions]
alternator a generator which produces alternating electrical current.