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"opening" is also used as a crossword clue. If that's what you saw, the answer is often orifice (7 letters).
Definitions
the first of a series of actions
Word origin
From Middle English openynge, openande, openand, from Old English openiende, from Proto-West Germanic *opanōndī, from Proto-Germanic *upanōndz, present participle of *upanōną (“to open”), equivalent to open + -ing. Cognate with West Frisian iepenjend, Dutch openend, German öffnend, Swedish öppnande, Icelandic opnandi.
Used in a sentence
“The opening theme of Beethoven's Fifth Symphony is, perhaps, the most recognizable in all of European art music.”
“The daily openings of the day lily bloom gives it its name.”
“He remembered fondly the Christmas morning opening of presents.”
Source: Wiktionary, CC BY-SA 4.0
Used as a crossword answer1 curated clues
01“Start or empty space”7 letters
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