A person who makes comments, remarks, or provides commentary on something.
From 'comment' (from Latin 'commentum', something thought out) plus the agent suffix '-er' (one who does). This straightforward word has been used since at least the 18th century.
The rise of online 'commenters' has fundamentally changed how institutions function—comments sections on news sites now influence editorial decisions, proving that historically, the person reacting to the text became almost as important as the text itself!
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