Originally (as specific use of sense 1), a separate paper or slip of parchment accompanying or appended to a document, and containing explanatory or…

The action or practice of making remarks or comments; (frequently) an instance of this, a disquisition (on or upon a topic, text, etc.).

A treatise consisting of a systematic series of comments or annotations on the text of a literary work; an expository treatise following the order…

Varied comment (on a theme); amplification of a point made in discussion; a comment, observation, or remark; (occasionally) †censorious…

The action or an act of annotating a text, document, diagram, etc.; provision of explanatory or descriptive notes. Cf. annotate, v. 3a.

An explanation or interpretation of a text, esp. of scripture or a scriptural passage. Also more generally: a critical discourse or commentary.

figurative. A practical exemplification of or commentary upon some principle, maxim, etc. Obsolete.

A guide to the meaning or tone of a writer's work. Obsolete. rare.

In a newspaper, magazine, etc.: a paragraph or article on a newly published book, a performance of a play, etc.; a review (frequently in plural).