n. A series or collection of comments or annotations; especially, an explanation or elucidation of difficult and obscure passages in a book or other writing, and consideration of questions suggested by them, arranged in the same order as in the text or writing examined; an explanatory essay or treatise: as, a commentary on the Bible. A textual commentary explains the author's meaning, sentence by sentence.n. Anything that serves to explain or illustrate; an exemplification.n. A historical narrative; an explanatory record of particular transactions: as, the Commentaries of Cæsar.n. Synonyms See remark, n.To write notes or comments.To comment upon.