Meaning

verb acknowledge faults or shortcomings or failing

verb defend, explain, clear away, or make excuses for by reasoning

originFrom apology + -ize, from ἀπολογία (apología, “a speech in defense”), from ἀπολογέομαι (apologéomai, “to speak in one’s defense”), from ἀπόλογος (apólogos, “an account, story”), compound of ἀπο- (apo-, “from, off”) and λόγος (lógos, “speech”); compare also ἀπολογίζομαι (apologízomai, “to render an account”).

Etymology from Wiktionary, CC BY-SA 3.0