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Definition of orifice:

  1. A mouth or aperture, as of a tube, pipe, etc.; an opening; as, the orifice of an artery or vein; the orifice of a wound.

Synonyms:

hatchway, curtain raising, possibility, opening move, scuttle, possible action, outlet, opening, first step, initiative, porta, vent, chess opening, opening night, open.

Usage examples: