Adjective

1. Used of mouth or eyes

Verb

1. Cause to open or to become open
2. Start to operate or function or cause to start operating or functioning
3. Become open
4. Begin or set in action, of meetings, speeches, recitals, etc.
5. Spread out or open from a closed or folded state
6. Make available
7. Become available
8. Have an opening or passage or outlet
9. Make the opening move
10. Afford access to
11. Display the contents of a file or start an application as on a computer