Definitions of note:

• noun:   a characteristic emotional quality

  Example: "It ended on a sour note"

• noun:   a brief written record

  Example: "He made a note of the appointment"

• noun:   a short personal letter
• noun:   a comment or instruction (usually added)

  Example: "His notes were appended at the end of the article"

• noun:   a notation representing the pitch and duration of a musical sound

  Example: "The singer held the note too long"

• noun:   a tone of voice that shows what the speaker is feeling

  Example: "There was a note of uncertainty in his voice"

• noun:   a promise to pay a specified amount on demand or at a certain time

  Example: "I had to co-sign his note at the bank"

• noun:   a piece of paper money (especially one issued by a central bank)

  Example: "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

  Example: "Take note of this chemical reaction"

• verb:   make mention of

  Example: "They noted that it was a fine day to go sailing"

• verb:   make a written note of

  Example: "She noted everything the teacher said that morning"

• verb:   notice or perceive

  Example: "She noted that someone was following her"