Quick definitions from WordNet (note)

▸ noun:  a characteristic emotional quality ("It ended on a sour note")
▸ noun:  a brief written record ("He made a note of the appointment")
▸ noun:  a short personal letter
▸ noun:  a comment or instruction (usually added) ("His notes were appended at the end of the article")
▸ noun:  a notation representing the pitch and duration of a musical sound ("The singer held the note too long")
▸ noun:  a tone of voice that shows what the speaker is feeling ("There was a note of uncertainty in his voice")
▸ noun:  a promise to pay a specified amount on demand or at a certain time ("I had to co-sign his note at the bank")
▸ noun:  a piece of paper money (especially one issued by a central bank) ("He peeled off five one-thousand-zloty notes")
▸ noun:  high status importance owing to marked superiority
▸ verb:  observe with care or pay close attention to ("Take note of this chemical reaction")
▸ verb:  make mention of ("They noted that it was a fine day to go sailing")
▸ verb:  make a written note of ("She noted everything the teacher said that morning")
▸ verb:  notice or perceive ("She noted that someone was following her")

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▸ Also see note