Origin: 1400–50;late Middle Englishapologetik a formal defense (< Middle French) < Late Latinapologēticus written defense, defensive < Greekapologētikós fit for defense, equivalent to apologē- (variant stem of apologeîsthai to speak in defense; see apologia) + -tikos-tic
1640s, "vindicatory," from Fr. apologétique, from L. apologeticus, from Gk. apologetikos "defensible," from apologeisthai (see apology). Meaning "regrefully acknowledging failure" is from 1855. Related: Apologetics (c.1753).