open in WordNet English dictionary

1. afford access to
   "the door opens to the patio"; "The French doors give onto a terrace"
   afford  open  give 
   
2. make available
   "This opens up new possibilities"
   open  open up 
   
3. become available
   "an opportunity opened up"
   open  open up 
   
4. make the opening move
   "Kasparov opened with a standard opening"
   open 
   
5. cause to open or to become open
   "Mary opened the car door"
   open  open up 
   
6. become open
   "The door opened"
   open  open up 
   
7. spread out or open from a closed or folded state
   "open the map"; "spread your arms"
   unfold  spread  spread out  open 
   
8. display the contents of a file or start an application as on a computer
   open 
   
9. start to operate or function or cause to start operating or functioning
   "open a business"
   open  open up 
   
10. begin or set in action, of meetings, speeches, recitals, etc.
    "He opened the meeting with a long speech"
    open 
    
11. have an opening or passage or outlet
    "The bedrooms open into the hall"
    open 
    

1. not defended or capable of being defended
   "an open city"; "open to attack"
   assailable  undefendable  undefended  open 
   
2. openly straightforward and direct without reserve or secretiveness
   "his candid eyes"; "an open and trusting nature"; "a heart-to-heart talk"
   candid  open  heart-to-heart 
   
3. 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"
   capable  open  subject 
   
4. affording free passage or view
   "a clear view"; "a clear path to victory"; "open waters"; "the open countryside"
   clear  open 
   
5. with no protection or shield
   "the exposed northeast frontier"; "open to the weather"; "an open wound"
   exposed  open 
   
6. (of textures) full of small openings or gaps
   "an open texture"; "a loose weave"
   loose  open 
   
7. ready or willing to receive favorably
   "receptive to the proposals"
   receptive  open 
   
8. affording unobstructed entrance and exit; not shut or closed
   "an open door"; "they left the door open"
   open  unfastened 
   
9. affording free passage or access
   "open drains"; "the road is open to traffic"; "open ranks"
   open 
   
10. (set theory) of an interval that contains neither of its endpoints
    open 
    
11. open and observable; not secret or hidden
    "an overt lie"; "overt hostility"; "overt intelligence gathering"; "open ballots"
    overt  open 
    
12. used of mouth or eyes
    "keep your eyes open"; "his mouth slightly opened"
    open  opened 
    
13. ready for business
    "the stores are open"
    open 
    
14. not having been filled
    "the job is still open"
    open 
    
15. not requiring union membership
    "an open shop employs nonunion workers"
    open 
    
16. open to or in view of all
    "an open protest"; "an open letter to the editor"
    open 
    
17. without undue constriction as from e.g. tenseness or inhibition
    "the clarity and resonance of an open tone"; "her natural and open response"
    open 
    
18. having no protecting cover or enclosure
    "an open boat"; "an open fire"; "open sports cars"
    open 
    
19. accessible to all
    "open season"; "an open economy"
    open 
    
20. not sealed or having been unsealed
    "the letter was already open"; "the opened package lay on the table"
    open  opened 
    
21. 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"
    open  undecided  undetermined  unresolved 
    

1. a clear or unobstructed space or expanse of land or water
   "finally broke out of the forest into the open"
   open  clear 
   
2. information that has become public
   "all the reports were out in the open"; "the facts had been brought to the surface"
   open  surface 
   
3. a tournament in which both professionals and amateurs may play
   open 
   
4. where the air is unconfined
   "he wanted to get outdoors a little"; "the concert was held in the open air"; "camping in the open"
   outdoors  out-of-doors  open air  open