Noun
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"