1. teach (a person or group) to accept a set of beliefs uncritically: "broadcasting was a vehicle for indoctrinating the masses"
▪ teach or instruct (someone):"he indoctrinated them in systematic theology"
Word Originearly 17th century: formerly also as endoctrinate): from en-1, in-2 ‘into’ + doctrine + -ate3, or from obsolete indoctrine (verb), from French endoctriner, based on doctrine ‘doctrine’.