Definition of "definer" [de•fin•er]

• Agent noun of define; one who defines. (noun)

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• "The field circle definer is naked to the elements around the base like a hula hoop."
• "At that point, the offended party tries to become the "definer" of what is a true Republican or a true Democrat."
• "Newt likes to think of himself as a definer, advocate, and teacher of the rules of civilization, and yet he insists on undermining education by forcing poor kids to work at a young age."