1 : a person who has been converted to another religious or political belief
2 : (psychiatry) a defense mechanism represses emotional conflicts which are then converted into physical symptoms that have no organic basis
3 : a complete change of physical form or substance especially as by magic or witchcraft
4 : (genetics) modification of a cell or bacterium by the uptake and incorporation of exogenous DNA
5 : the act of revising or altering (involving reconsideration and modification)
6 : preparing or putting through a prescribed procedure