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Definition of 'open'

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


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


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

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