1. (n.) A marginal annotation; an explanatory remark or comment; specifically, an explanatory comment on the text of a classic author by an early grammarian.

2. (n.) A remark or observation subjoined to a demonstration or a train of reasoning.

adversaria aide-memoire annotation apparatus criticus comment commentary commentation docket entry exegesis footnote gloss item jotting marginal note marginalia memo memoir memorandum memorial minutes notation note note of explanation register registry reminder scholia word of explanation