Definition of "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 piece of paper money (especially one issued by a central bank)
"He peeled off five one-thousand-zloty notes."
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: high status importance owing to marked superiority
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."
verb: observe with care or pay close attention to
"Take note of this chemical reaction."