(religious) Initialism of Ordo Praedicatorum (Order of Preachers, the Dominicans, a religious order).

Initialism of opening credits. / Initialism of opening theme.

Third-person singular simple present indicative form of ope

present participle of ope

simple past tense and past participle of ope

(computing) An instruction or operation that has no effect; a null operation.

(LGBT, of a transgender or transsexual person) Having chosen not to undergo sex reassignment surgery.

(LGBT) A transgender or transsexual person who has chosen not to undergo sex reassignment surgery.

present participle of op

(Internet) The promotion of an IRC user to operator status.