note

1. A mark or token by which a thing may be known; a visible sign; a character; a distinctive mark or feature; a characteristic quality. (countable, uncountable)
2. A mark, or sign, made to call attention, to point out something to notice, or the like; a sign, or token, proving or giving evidence. (countable, uncountable)
3. A brief remark; a marginal comment or explanation; hence, an annotation on a text or author; a comment; a critical, explanatory, or illustrative observation. (countable, uncountable)
4. A brief piece of writing intended to assist the memory; a memorandum; a minute. (countable, uncountable) · I left him a note to remind him to take out the trash.
5. A short informal letter; a billet. (countable, uncountable)
6. An academic treatise (often without regard to length); a treatment; a discussion paper; (loosely) any contribution to an academic discourse. (countable, literary, uncountable)
7. A diplomatic missive or written communication. (countable, uncountable)
8. A written or printed paper (or digital equivalent) acknowledging a debt, and promising payment. (countable, uncountable) · Near-synonyms: draft, bond, paper, commercial paper, IOU, letter of credit· a promissory note

Plural notes