Cŏm'men-ta-ry1, n.
n. [Lat. commentarius (sc. liber), and commentarium (sc. volumen), note-book, commentary; Fr. commentaire. See COMMENT, v. i.]
Sense 1. A series or collection of comments or annotations; especially a book of explanations or expositions on the work of any author.
This letter . . . was published by him with a severe commentary. Hallam.
Sense 2. A memoir of particular transactions; as, the Commentaries of Cæsar.