Someone who goes on dates; a person who dates or is dating someone romantically.
From 'date' (a romantic meeting or outing) plus the agent noun suffix '-er'. The term emerged in 20th-century English as dating culture became formalized.
The modern 'dater' has been transformed by technology—a dater in 1950 met someone through friends or church, while today's dater swipes through thousands of potential matches.
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