1. (noun) open, clear
a clear or unobstructed space or expanse of land or water
"finally broke out of the forest into the open"
2. (noun) outdoors, out-of-doors, open air, open
where the air is unconfined
"he wanted to get outdoors a little"; "the concert was held in the open air"; "camping in the open"
3. (noun) open
a tournament in which both professionals and amateurs may play
4. (adj) open, surface
information that has become public
"all the reports were out in the open"; "the facts had been brought to the surface"
5. (adj) open, unfastened
affording unobstructed entrance and exit; not shut or closed
"an open door"; "they left the door open"
6. (adj) open
affording free passage or access
"open drains"; "the road is open to traffic"; "open ranks"
7. (adj) exposed, open
with no protection or shield
"the exposed northeast frontier"; "open to the weather"; "an open wound"
8. (adj) open
open to or in view of all
"an open protest"; "an open letter to the editor"
9. (adj) open, opened
used of mouth or eyes
"keep your eyes open"; "his mouth slightly opened"
10. (adj) open
not having been filled
"the job is still open"
11. (adj) open
accessible to all
"open season"; "an open economy"
12. (adj) assailable, undefendable, undefended, open
not defended or capable of being defended
"an open city"; "open to attack"
13. (adj) loose, open
(of textures) full of small openings or gaps
"an open texture"; "a loose weave"
14. (adj) open
having no protecting cover or enclosure
"an open boat"; "an open fire"; "open sports cars"
15. (adj) open
(set theory) of an interval that contains neither of its endpoints
16. (adj) open, undecided, undetermined, unresolved
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"
17. (adj) open, opened
not sealed or having been unsealed
"the letter was already open"; "the opened package lay on the table"
18. (adj) open
without undue constriction as from e.g. tenseness or inhibition
"the clarity and resonance of an open tone"; "her natural and open response"
19. (adj) receptive, open
ready or willing to receive favorably
"receptive to the proposals"
20. (adj) overt, open
open and observable; not secret or hidden
"an overt lie"; "overt hostility"; "overt intelligence gathering"; "open ballots"
21. (adj) open(a)
not requiring union membership
"an open shop employs nonunion workers"
22. (adj) capable, open, subject
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"
23. (adj) clear, open
affording free passage or view
"a clear view"; "a clear path to victory"; "open waters"; "the open countryside"
24. (adj) candid, open, heart-to-heart
openly straightforward and direct without reserve or secretiveness
"his candid eyes"; "an open and trusting nature"; "a heart-to-heart talk"
25. (verb) open
ready for business
"the stores are open"
26. (verb) open, open up
cause to open or to become open
"Mary opened the car door"
27. (verb) open, open up
start to operate or function or cause to start operating or functioning
"open a business"
28. (verb) open, open up
become open
"The door opened"
29. (verb) open
begin or set in action, of meetings, speeches, recitals, etc.
"He opened the meeting with a long speech"
30. (verb) unfold, spread, spread out, open
spread out or open from a closed or folded state
"open the map"; "spread your arms"
31. (verb) open, open up
make available
"This opens up new possibilities"
32. (verb) open, open up
become available
"an opportunity opened up"
33. (verb) open
have an opening or passage or outlet
"The bedrooms open into the hall"
34. (verb) open
make the opening move
"Kasparov opened with a standard opening"
35. (verb) afford, open, give
afford access to
"the door opens to the patio"; "The French doors give onto a terrace"
36. (verb) open
display the contents of a file or start an application as on a computer
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Definition of 'open' 
