1. [Adjective]: used of string or hole or pipe of instruments

2. [Adjective]: open and observable; not secret or hidden; "an overt lie"; "overt hostility"; "overt intelligence gathering"

3. [Adjective]: affording free passage or access; "open drains"; "the road is open to traffic"; "open ranks"

4. [Adjective]: of a set; containing points whose neighborhood consists of other points of the same set, or being the complement of an open set; of an interval; containing neither of its end points

5. [Adjective]: affording unobstructed entrance and exit; not shut or closed; "an open door"; "they left the door open"

6. [Adjective]: used of mouth or eyes; "keep your eyes open"; "his mouth slightly opened"

7. [Noun]: a tournament in which both professionals and amateurs may play

8. [Noun]: a clear or unobstructed space or expanse of land or water; "finally broke out of the forest into the open"

9. [Noun]: information that has become public; "all the reports were out in the open"; "the facts had been brought to the surface"

10. [Noun]: where the air is unconfined; "he wanted to get outdoors a little"; "the concert was held in the open air"; "camping in the open"

11. not having been filled; "the job is still open"

12. with no protection or shield; "the exposed northeast frontier"; "open to the weather"; "an open wound"

13. opened out; "an open newspaper"

14. not sealed or having been unsealed; "the letter was already open"; "the opened package lay on the table"

15. sincere and free of reserve in expression; "Please be open with me"

16. not secret; "open plans"; "an open ballot"

17. lax in enforcing laws; "an open town"

18. (of textures) full of small openings or gaps; "an open texture"; "a loose weave"

19. affording free passage or view; "a clear view"; "a clear path to victory"

20. not defended or capable of being defended; "an open city"; "open to attack"

21. having no protecting cover or enclosure; "an open boat"; "an open fire"; "open sports cars"

22. ready for business; "the stores are open"

23. open to or in view of all; "an open protest"; "an open letter to the editor"

24. receptive to new ideas; "an open mind"; "open to new ideas"

25. accessible to all; "open season"; "an open economy"

26. relatively empty of and unobstructed by fences or hedges or headlands or shoals; "in open country"; "the open countryside"; "open waters"; "on the open seas"

27. without any attempt at concealment; completely obvious; "open disregard of the law"; "open family strife"; "open hostility"; "a blatant appeal to vanity"; "a blazing indiscretion"

28. openly straightforward and direct without reserve or secretiveness; "his candid eyes"; "an open and trusting nature"; "a heart-to-heart talk"

29. not brought to a conclusion; subject to further thought; "an open question"; "our position on this bill is still undecided"; "our lawsuit is still undetermined"

30. without undue constriction as from e.g. tenseness or inhibition; "the clarity and resonance of an open tone"; "her natural and open response"

31. possibly accepting or permitting; "a passage capable of misinterpretation"; "open to interpretation"; "an issue open to question"; "the time is fixed by the director and players and therefore subject to much variation"

32. [Verb]: begin or set in action, of meetings, speeches, recitals, etc.; "He opened the meeting with a long speech"

33. [Verb]: have an opening or passage or outlet; "The bedrooms open into the hall"

34. [Verb]: become available; "an opportunity opened up"

35. [Verb]: cause to open or to become open; "Mary opened the car door"

36. [Verb]: spread out or open from a closed or folded state; "open the map"; "spread your arms"

37. [Verb]: afford access to; "the door opens to the patio"; "The French doors give onto a terrace"

38. [Verb]: start to operate or function or cause to start operating or functioning; "open a business"

39. [Verb]: make available; "This opens up new possibilities"

40. [Verb]: make the opening move; "Kasparov opened with a standard opening"

41. [Verb]: become open; "The door opened"

42. [Verb]: display the contents of a file or start an application as on a computer

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