Etymology
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note (n.)

c. 1300, "a song, music, melody; instrumental music; a bird-song; a musical note of a definite pitch," from Old French note and directly from Latin nota "letter, character, note," originally "a mark, sign, means of recognition," which traditionally has been connected to notus, past participle of noscere "to come to know," but de Vaan reports this is "impossible," and with no attractive alternative explanation, it is of unknown origin.

Meaning "notice, attention" is from early 14c.; that of "reputation, fame" is from late 14c. From late 14c. as "mark, sign, or token by which a thing may be known." From late 14c. as "a sign by which a musical tone is represented to the eye." Meaning "a brief written abstract of facts" is from 1540s; meaning "a short, informal written communication" is from 1590s. From 1550s as "a mark in the margin of a book calling attention to something in the text," hence "a statement subsidiary to the text adding or elucidating something." From 1680s as "a paper acknowledging a debts, etc." In perfumery, "a basic component of a fragrance which gives it its character," by 1905.

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note (v.)

c. 1200, noten, "observe, take mental note of, mark carefully," from Old French noter "indicate, designate; take note of, write down," from Latin notare "to mark, note, make a note," from nota "mark, sign, note, character, letter" (see note (n.)). Sense of "mention separately or specially among others" is from late 14c. Meaning "to set down in writing, make a memorandum of" is from early 14c. Related: Noted; noting.

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note-paper (n.)

"writing paper of small sizes, suitable for notes or correspondence," 1848, from note (n.) + paper (n.).

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notepad (n.)

also note-pad, "pad of paper for writing notes," 1907, from note (n.) + pad (n.).

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notebook (n.)

also note-book, "book in which notes may be entered," 1570s, from note (n.) + book (n.).

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noteworthy (adj.)

"worthy of notice, remarkable," 1550s, from note (v.) + worthy. Related: Noteworthiness.

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noted (adj.)

c. 1300, "observed," past-participle adjective from note (v.). Meaning "observed for some special quality, conspicuous, distinguished" is from mid-15c. Related: Notedness.

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notate (v.)

"set down in musical notation," 1871, a back-formation from notation, or else from Latin notatus, past participle of notare "to mark, note, make a note," from nota "mark, sign, means of recognition" (see note (n.)). Related: Notated; notating.

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nota bene 

a Latin phrase meaning "mark well, observe particularly," 1721, from Latin nota, second person singular imperative of notare "to mark" (from nota "mark, sign, note, character, letter;" see note (n.)) + bene "well" (see bene-). Often abbreviated N.B.

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