a person who has received a diploma, esp. a doctor, engineer, etc., who has been certified as a specialist by a board within the appropriate profession.
Main Entry: dip·lo·mate Pronunciation: 'dip-l&-"mAt Function: noun : one who holds a diploma; especially: a physicianqualified to practice in a medical specialty by advanced training and experience in the specialty followed by passing an intensive examination by a national board of senior specialists