note

noun

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.
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.
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.
4. A brief piece of writing intended to assist the memory; a memorandum; a minute.
5. A short informal letter; a billet.
6. An academic treatise (often without regard to length); a treatment; a discussion paper; (loosely) any contribution to an academic discourse.
7. A diplomatic missive or written communication.
8. A written or printed paper (or digital equivalent) acknowledging a debt, and promising payment.
9. A list of items or of charges; an account.
10. A piece of paper or polymer money; a banknote.
11. A small size of paper used for writing letters or notes.
12. A character, variously formed, to indicate the length of a tone, and variously placed upon the staff to indicate its pitch.
13. A musical sound; a tone; an utterance; a tune; a beat of a drum.
14. A key of the piano or organ.
15. A call or song of a bird.
16. An indicator to which the player must correctly time some input.
17. An element of a scent, fragrance, or perfume, especially as a descriptor or category.
18. Observation; notice; heed.
19. Reputation; distinction.
20. A critical comment.