n. [ Acronym from alternating current. ] an electric current that reverses direction sinusoidally. Alternative to direct curent, DC. [ acron. ]
Syn. -- alternating current [ WordNet 1.5 ]

n. 1. the chemical symbol for actinum, a radioactive element.
Syn. -- actinium [ WordNet 1.5 ]

n. (Antiq.) A roll or bag, filled with dust, borne by Byzantine emperors, as a memento of mortality. It is represented on medals. [ 1913 Webster ]

n.; pl. E. acacias L. acaciae [ L. from Gr. 'akaki`a; orig. the name of a thorny tree found in Egypt; prob. fr. the root ak to be sharp. See Acute. ] 1. [ capitalized ] A genus of leguminous trees and shrubs. Nearly 300 species are Australian or Polynesian, and have terete or vertically compressed leaf stalks, instead of the bipinnate leaves of the much fewer species of America, Africa, etc. Very few are found in temperate climates. [ 1913 Webster ]

2. (Med.) The inspissated juice of several species of acacia; -- called also gum acacia, and gum arabic. AS [ 1913 Webster ]

n. Gum arabic. [ 1913 Webster ]

n. [ L. academia. See Academy. ] An academy. [ Poetic ] Shak. [ 1913 Webster ]

a. Academic. [ R. ] [ 1913 Webster ]

n. A member of an academy, university, or college. [ 1913 Webster ]

n. 1. One holding the philosophy of Socrates and Plato; a Platonist. Hume. [ 1913 Webster ]

2. A member of an academy, college, or university; an academician. [ 1913 Webster ]

{ } a. [ L. academicus: cf. F. académigue. See Academy. ] 1. Belonging to the school or philosophy of Plato; as, the Academic sect or philosophy. [ 1913 Webster ]

2. Belonging to an academy or other higher institution of learning; scholarly; literary or classical, in distinction from scientific. “Academic courses.” Warburton. “Academical study.” Berkeley. [ 1913 Webster ]