Noun

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

Verb

• S: (v) open, open up (cause to open or to become open) "Mary opened the car door"
• S: (v) open, open up (start to operate or function or cause to start operating or functioning) "open a business"
• S: (v) open, open up (become open) "The door opened"
• S: (v) open (begin or set in action, of meetings, speeches, recitals, etc.) "He opened the meeting with a long speech"
• S: (v) unfold, spread, spread out, open (spread out or open from a closed or folded state) "open the map"; "spread your arms"
• S: (v) open, open up (make available) "This opens up new possibilities"
• S: (v) open, open up (become available) "an opportunity opened up"
• S: (v) open (have an opening or passage or outlet) "The bedrooms open into the hall"
• S: (v) open (make the opening move) "Kasparov opened with a standard opening"
• S: (v) afford, open, give (afford access to) "the door opens to the patio"; "The French doors give onto a terrace"
• S: (v) open (display the contents of a file or start an application as on a computer)

Adjective

• S: (adj) opening (first or beginning) "the memorable opening bars of Beethoven's Fifth"; "the play's opening scene"