commentary n.

late 14c., "explanation, spoken or written remark," from Old French coment "commentary" or directly from Late Latin commentum "comment, interpretation," in classical Latin "invention, fabrication, fiction," neuter past participle of comminisci "to contrive, devise," from com-, here perhaps an intensive prefix (see com-), + base of meminisse "to remember," related to mens (genitive mentis) "mind" (from PIE root *men- (1) "to think").

The Latin word meaning "something invented" was taken by Isidore and other Christian theologians for "interpretation, annotation." No comment as a stock refusal to answer a journalist's question is first recorded 1950, from Truman's White House press secretary Charles Ross.

late 14c., "writer of commentaries," agent noun in Latin form from comment or commentary (Latin commentator meant "inventor, author," in Late Latin "interpreter"). Meaning "writer of notes or expository comments" is from 1640s; sense of "one who gives commentary" (originally in sports) is from 1928. Related: Commentatorial.

"Well, Jem, what is a commentator?["]—"Why," was Jem's reply, "I suppose it must be the commonest of all taturs." ["Smart Sayings of Bright Children," collected by Howard Paul, 1886]