[n] the act of opening something; "the ray of light revealed his cautious opening of the door"
[n] the first of a series of actions; "he memorized all the important chess openings"
[n] becoming open or being made open; "the opening of his arms was the sign I was waiting for"
[n] an entrance equipped with a hatch; especially a passageway between decks of a ship
[n] a vacant or unobstructed space; "they left a small opening for the cat at the bottom of the door"
[n] an aperture or hole opening into a bodily cavity; "the orifice into the aorta from the lower left chamber of the heart"
[n] a possible alternative; "bankruptcy is always a possibility"
[n] the initial part of the introduction; "the opening established the basic theme"
[n] the first performance (as of a theatrical production); "the opening received good critical reviews"
[n] a ceremony accompanying the start of some enterprise
[n] an 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] opportunity especially for employment or promotion; "there is an opening in the sales department"
[adj] first or beginning; "the memorable opening bars of Beethoven's Fifth"; "the play's opening scene"
beginning(a), curtain raising, first, first step, gap, hatchway, inaugural, initiative, initiative, initiatory, introductory, maiden, opening move, opening night, orifice, porta, possibility, possible action, scuttle, starting