Definition of "OP"

Initialism of Overall Position.  examples

(theater) Initialism of opposite prompt; stage right.  examples

(Internet) Initialism of original poster; the person who started a thread.  examples

(Internet) Initialism of original post.  examples

(military, law enforcement) Initialism of observation post.

(organic chemistry) Abbreviation of organophosphate.  examples

(slang) Initialism of other person's; a cigarette cadged from someone.

Abbreviation of outpatient.  examples

(publishing) Abbreviation of out of print.  examples

Abbreviation of overproof.  examples

(video games) Abbreviation of overpowered.  quotations  examples

(Internet, music) Initialism of overplayed.  examples

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

Initialism of opening credits.  examples

Initialism of opening theme.  examples