Etymology
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archaic (adj.)

1810, from or by influence of French archaique (1776), ultimately from Greek arkhaikos "old-fashioned," from arkhaios "ancient, old-fashioned, antiquated, primitive," from arkhē "beginning, origin," verbal noun of arkhein "to be the first," hence "to begin" and "to rule" (see archon). Not merely crude, the archaic has "a rudeness and imperfection implying the promise of future advance" [Century Dictionary]. Archaical is attested from 1799.

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Definitions of archaic

archaic (adj.)
so extremely old as seeming to belong to an earlier period;
archaic laws
archaic (adj.)
little evolved from or characteristic of an earlier ancestral type;
archaic forms of life
Synonyms: primitive
From wordnet.princeton.edu