note

1 note /ˈnoʊt/ noun
plural notes
1 note
/ˈnoʊt/
noun
plural notes
Britannica Dictionary definition of NOTE
1 
a  [count] : a short piece of writing that is used to help someone remember something
b  notes [plural] : an informal written record of things that are said and done
2 
[count]
a  : a short piece of writing that gives you information : a brief comment or explanation
— see also liner notes
b  : a comment or added piece of information that is separate from the main writing of a book — see also footnote
3 
[count] : a short and usually informal letter
— see also mash note
4 
[count] music
a  : a specific musical tone
b  : a written symbol that is used to show what note should be played and how long it should last — see also eighth note, half note, quarter note, sixteenth note, whole note
5 
[singular] : a characteristic or quality that expresses a mood or feeling — often used after on
— often used with hit, strike or sound

compare notes

— see 1compare

of note

: important and deserving to be noticed or remembered

take note

: to notice or give special attention to someone or something
2 note /ˈnoʊt/ verb
notes; noted; noting
2 note
/ˈnoʊt/
verb
notes; noted; noting
Britannica Dictionary definition of NOTE
[+ object] formal
1 
: to notice or pay attention to (something)
— often + that
2 
: to say or write (something)
— often + that

note down

[phrasal verb]
note (something) down or note down (something)
: to write down (a piece of information that you want to remember)