commentary

noun

Etymology: From Middle French commentaire, from Latin commentārius, commentārium (“notebook”), compare French commentaire. See comment.

1. A series of comments or annotations; especially, a book of explanations or expositions on the whole or a part of some other work.

   “This letter […] was published by him with a severe commentary.”

   “Under each coin was a circular ticket with written particulars of the specimen accompanying it. For some time Carrados took little interest in these commentaries, but presently Hosier noticed that his guest was submitting many of them to a close but quiet scrutiny.”

2. A brief account of transactions or events written hastily, as if for a memorandum.

   “Caesar's Commentaries on the Gallic War”

3. An oral relation of an event, especially broadcast by television or radio, as it occurs.

   “We listened to the football commentary while watching the match.”