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op: /op/, n.

1. In England and Ireland, common verbal abbreviation for ‘operator’, as in system operator. Less common in the U.S., where sysop seems to be preferred.

2. [IRC] Someone who is endowed with privileges on IRC, not limited to a particular channel. These are generally people who are in charge of the IRC server at their particular site. Sometimes used interchangeably with CHOP. Compare sysop.