noun

• (uncountable) The act of commenting.
  "People bled to death like gentlemen in an operating room or expired without comment in an oxygen tent."
• (linguistics) The part of a sentence that provides new information regarding the current theme.
• (programming) A remark embedded in source code in such a way that it will be ignored by the compiler or interpreter, typically to help people to understand the code.

verb

• (transitive) To remark.
  "“My Continental prominence is improving,” I commented dryly. ¶ Von Lindowe cut at a furze bush with his silver-mounted rattan. ¶ “Quite so,” he said as dryly, his hand at his mustache. “I may say if your intentions were known your life would not be worth a curse.”"
• (intransitive, with "on" or "about") To make remarks or notes; to express a view regarding.
  "He commented about your proposal."
• (transitive, obsolete) To comment or remark on.
  "[…]who have expounded Scripture out of its Senses, and have so Commented the Laws thereof"
• (transitive, software, of code) To insert comments into (source code).
  "I wish I'd commented this complicated algorithm back when I remembered how it worked."