Is it ensure, insure, or assure?
early 15c., conformyte, from Middle French conformité (14c.), from Late Latin conformitatem (nominative conformitas), from conformis "similar in shape," from conformare (see conform). Modern form is from 17c.
Agreement between an individual's behavior and a group's standards or expectations. A conformist is one who follows the majority's desires or standards. (See also beatniks, bureaucrat, organization man, peer group, and peer pressure.)