Definitions of comment:

• noun:   a written explanation or criticism or illustration that is added to a book or other textual material

  Example: "He wrote an extended comment on the proposal"

• noun:   a statement that expresses a personal opinion or belief

  Example: "From time to time she contributed a personal comment on his account"

• noun:   a report (often malicious) about the behavior of other people
• verb:   explain or interpret something
• verb:   make or write a comment on

  Example: "He commented the paper of his colleague"

• verb:   provide interlinear explanations for words or phrases
• name:  A surname (very rare: popularity rank in the U.S.: #86580)