v. i. - To make remarks, observations, or criticism; especially, to write notes on the works of an author, with a view to illustrate his meaning, or to explain particular passages; to write annotations; -- often followed by on or upon.
v. t. - To comment on.
n. - A remark, observation, or criticism; gossip; discourse; talk.
n. - A note or observation intended to explain, illustrate, or criticise the meaning of a writing, book, etc.; explanation; annotation; exposition.