non-op /nɒnˈɒp/adjective 4noun 2forms 1 adjective4 •(informal) Nonoperative; not using or requiring surgical treatment. •(informal) Having chosen not to undergo sex reassignment surgery."Just so you know, Vincent, I was a pre-op transsexual. But after my breasts grew and my hips got wider, I was happy with what I had and decided to go non-op." — 2010 •(informal) Nonoperational; not functioning.Why he had taken refuge in the chapel, he didn't know. His mind had been non-op for a long time now and he just let the impulses flow. — 1980 •(informal) Nonoperating; not directly involved in the mechanical operation of trains.About 200000 "non-op" workers - clerks, telegraphers, machinists, and others not actually involved in operation of the roads - are not union members. — 1951 noun2 •(informal) A transsexual or transgender person who has chosen not to undergo sex reassignment surgery.It is interesting that Galatea makes reference to some encouragement from "post-op" transsexuals, though other "non-ops" advise surgical candidates to reconsider their decision. — 1998 •(informal) A nonoperator; a rail worker not directly involved in the mechanical operation of trains.For example, in the fall of 1973, when we had a rail strike, the government brought in legislation putting the non-ops back to work at an increase of only 30 cents an hour […] — 1980 formsnon-ops