commentary (n.)youdaoicibaDictYouDict[commentary 词源字典]
1530s, from Middle French commentaire, or directly from Latin commentarius "notebook, annotation; diary, memoir," noun use of adjective, "relating to comments," from commentum (see comment (n.)). Perhaps the Latin noun is short for volumen commentarium. Originally in English as an adjective (early 15c.).[commentary etymology, commentary origin, 英语词源]