note

noun:a brief written record, as an aid to memory
- She took a quick note of the appointment time.
noun:a brief written record or message
- I wrote a note to thank him for his help.
noun:a musical tone with a particular pitch and duration
- The singer held the high note perfectly.
noun:a particular quality or tone that reflects an attitude or mood
- There was a note of sarcasm in his voice.
noun:a piece of paper money
- I paid with a twenty-pound note.
verb:to notice or pay careful attention to something
- Please note that the office will be closed tomorrow.
verb:to record something in writing
- The student noted the professor's main points.