WordNet sense 1 (high status importance owing to marked superiority):

distinction, eminence, preeminence

WordNet sense 2 (a promise to pay a specified amount on demand or at a certain time):

promissory note, note of hand

WordNet sense 3 (a piece of paper money (especially one issued by a central bank)):

banknote, bill, greenback, bank bill, banker's bill, Federal Reserve note, government note

WordNet sense 4 (a notation representing the pitch and duration of a musical sound):

tone, musical note

WordNet sense 5 (a comment or instruction (usually added)):

annotation, notation

WordNet sense 6 (a short personal letter):

billet, line, short letter

WordNet sense 7 (observe with care or pay close attention to):

observe, take note

WordNet sense 8 (notice or perceive):

mark, notice

WordNet sense 9 (make a written note of):

take down

WordNet sense 10 (make mention of):

mention, remark