any person at all; anybody: Did anyone see the accident?
Origin: 1350–1400;Middle Englishani on. See any, one
Usage note Anyone as a pronoun meaning “anybody” or “any person at all” is written as one word: Does anyone have the correct time? The two-word phrase any one means “any single member of a group of persons or things” and is often followed by of: Can any one of the members type? Any one of these books is exciting reading.Anyone is somewhat more formal than anybody. See also each, they.