Open English Wordnet
Nouns
(n)opening, gapan open or empty space in or between things“there was a small opening between the trees”,
“the explosion made a gap in the wall” (n)openinga ceremony accompanying the start of some enterprise (n)openingbecoming open or being made open“the opening of his arms was the sign I was waiting for” (n)openingthe act of opening something“the ray of light revealed his cautious opening of the door” (n)openingopportunity especially for employment or promotion“there is an opening in the sales department” (n)openingthe initial part of the introduction“the opening established the basic theme” (n)orifice, opening, portaan aperture or hole that opens into a bodily cavity“the orifice into the aorta from the lower left chamber of the heart” (n)openinga vacant or unobstructed space that is man-made“they left a small opening for the cat at the bottom of the door” (n)hatchway, opening, scuttlean entrance equipped with a hatch; especially a passageway between decks of a ship (n)opening, chess openinga recognized sequence of moves at the beginning of a game of chess“he memorized all the important chess openings” Adjectives
(a)openingfirst or beginning“the memorable opening bars of Beethoven's Fifth”,
“the play's opening scene” 