Definitions from Wiktionary (OP)

▸ noun:  (informal) Clipping of operator.
▸ noun:  (informal) An amateur radio operator.
▸ noun:  (Internet) An operator on IRC, who can moderate the chat channel, ban users, etc.
▸ verb:  (transitive, Internet) To promote (an IRC user) to an operator.
▸ verb:  (Australia, informal, transitive) To buy (something) from an op shop.
▸ verb:  (Australia, informal, intransitive) To shop at op shops.
▸ noun:  (informal) Clipping of operation. [(uncountable) The method by which a device performs its function.]
▸ noun:  (Internet slang, chiefly in the plural) Clipping of opinion. [A belief, judgment or perspective that a person has formed, either through objective or subjective reasoning, about a topic, issue, person or thing.]
▸ noun:  (chiefly attributive) Ellipsis of op art. [(art) A genre of abstract art that uses geometric shapes and vivid colours to create optical illusions, such as an illusion of movement.]
▸ noun:  Alternative letter-case form of OP.
▸ adjective:  Alternative letter-case form of OP.
▸ noun:  (slang, among criminal gangs) Alternative form of opp (“opponent; opposition”). [(slang, originally among criminal gangs) An opponent; an enemy; the opposition.]
▸ noun:  Initialism of Overall Position.
▸ noun:  (theater) Initialism of opposite prompt; stage right.
▸ noun:  (Internet) Initialism of original poster; the person who started a thread.
▸ noun:  (Internet) Initialism of original post.
▸ noun:  (military, law enforcement) Initialism of observation post. [a lookout or vantage point]
▸ noun:  (organic chemistry) Abbreviation of organophosphate. [(chemistry) Any ester of phosphoric acid or its derivatives, especially one used as an insecticide or herbicide.]
▸ noun:  (slang) Initialism of other person's; a cigarette cadged from someone.
▸ noun:  Abbreviation of outpatient. [(healthcare) A patient who receives treatment at a hospital or clinic but is not admitted overnight; a receiver of ambulatory care.]
▸ noun:  (Philippines, some other countries, politics) Initialism of Office of the President.
▸ adjective:  (publishing) Abbreviation of out of print.
▸ adjective:  Abbreviation of overproof. [Possessing a higher proportion of alcohol than proof spirit.]
▸ adjective:  (gaming) Abbreviation of overpowered. [Overly powerful.]
▸ adjective:  (Internet, music) Initialism of overplayed. [Played too frequently.]
▸ noun:  (religious) Initialism of Ordo Praedicatorum (Order of Preachers, the Dominicans, a religious order).
▸ noun:  Initialism of opening credits. [The credits shown at the beginning of a film, TV program, etc.]
▸ noun:  Initialism of opening theme.

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