Note  noun
/noʊt/

1. in music
[countable] a single sound of a particular length and pitch (= how high or low the sound is), made by the voice or a musical instrument; the written or printed sign for a musical note

He played the first few notes of the tune.

high/low notes

2. information
notes [plural] information that you write down when someone is speaking, or when you are reading a book, etc.

He sat taking notes on everything that was said.

Can I borrow your lecture notes?