Convert - noun a person who has been converted to another religious or political belief; verb change in nature, purpose, or function; undergo a chemical change; change the nature, purpose, or function of something; change from one system to another or to a new plan or policy; change religious beliefs, or adopt a religious belief; cause to adopt a new or different faith; make (someone) agree, understand, or realize the truth or validity of something; score (a spare); complete successfully; score an extra point or points after touchdown by kicking the ball through the uprights or advancing the ball into the end zone; exchange or replace with another, usually of the same kind or category; exchange a penalty for a less severe one