mention (n.) Look up mention at Dictionary.com
c.1300, from O.Fr. mencion "call to mind," from L. mentionem (nom. mentio) "a calling to mind, a speaking of, mention," from root of Old L. minisci "to think," related to mens (gen. mentis) "mind," from PIE base *men- "think" (see mental). The verb is first attested 1530. Don't mention it as a conventional reply to expressions of gratitude or apology is attested from 1840.