Source : Webster's Revised Unabridged Dictionary (1913)

Archaic \Ar*cha"ic\, a. [Gr. 'archai:ko`s old-fashioned, fr.
   'archai^os ancient.]
   Of or characterized by antiquity or archaism; antiquated;
   obsolescent.

Source : WordNet®

archaic
     adj 1: so extremely old as seeming to belong to an earlier period;
            "a ramshackle antediluvian tenement"; "antediluvian
            ideas"; "archaic laws" [syn: {antediluvian}, {antiquated}]
     2: little evolved from or characteristic of an earlier
        ancestral type; "archaic forms of life"; "primitive
        mammals"; "the okapi is a short-necked primitive cousin of
        the giraffe" [syn: {primitive}]