1. 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"
2. a ceremony accompanying the start of some enterprise
3. becoming open or being made open;"the opening of his arms was the sign I was waiting for"
4. the first performance (as of a theatrical production);"the opening received good critical reviews"
5. the act of opening something;"the ray of light revealed his cautious opening of the door"
6. opportunity especially for employment or promotion;"there is an opening in the sales department"
7. the initial part of the introduction;"the opening established the basic theme"
8. a possible alternative;"bankruptcy is always a possibility"
9. an aperture or hole opening into a bodily cavity;"the orifice into the aorta from the lower left chamber of the heart"
10. a vacant or unobstructed space that is man-made;"they left a small opening for the cat at the bottom of the door"
11. an entrance equipped with a hatch; especially a passageway between decks of a ship
12. the first of a series of actions;"he memorized all the important chess openings"