What does OPENING mean?

noun

1. an open or empty space in or between things“there was a small opening between the trees”
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”