An Etymological Dictionary of Astronomy and Astrophysics

1a) A remark, observation, or criticism (Dictionary.com).

1b) A note in explanation, expansion, or criticism of a passage in a book, article, or the like; annotation (Dictionary.com).

2. To make remarks, observations, or criticisms (Dictionary.com).

Etymology (EN): M.E. coment, from O.Fr. coment “commentary;” L.L. commentum “comment, interpretation,” in classical L. “invention, fiction,” from comminisci “to contrive, devise,” from → com-, intensive prefix + base of meminisse “to remember,” related to mens, → mind.

Etymology (PE): Hâmat, from hâ-, intensive prefix,
variant of ham-, → com-,

• mat- “think; thought,” from Av. mat- matay- “to think,” humat- “good thought;” cf. Skt. matāy-.