c. 1600, "to bring out of barbarism, introduce order and civil organization among, refine and enlighten," from French civiliser, verb from Old French civil (adj.), from Latin civilis "relating to a citizen, relating to public life, befitting a citizen; popular, affable, courteous," alternative adjectival derivative of civis "townsman" (see city). Intransitive meaning "become civilized" is from 1868. Related: Civilized; civilizing.
<a href="https://www.etymonline.com/word/Civilized">Etymology of Civilized by etymonline</a>
Harper, D. (n.d.). Etymology of Civilized. Online Etymology Dictionary. Retrieved $(datetime), from https://www.etymonline.com/word/Civilized