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Adjective open has 28 senses
  1. open, unfastened - affording unobstructed entrance and exit; not shut or closed; "an open door"; "they left the door open"
    Antonyms: shut, unopen, closed
  2. open - affording free passage or access; "open drains"; "the road is open to traffic"; "open ranks"
    closed, blocked, out of use, nonopening, drawn, stoppered
  3. exposed, open - with no protection or shield; "the exposed northeast frontier"; "open to the weather"; "an open wound"
    Antonyms: protected, secure (indirect, via unprotected)
  4. open - open to or in view of all; "an open protest"; "an open letter to the editor"
    private (indirect, via public)
  5. open, opened - used of mouth or eyes; "keep your eyes open"; "his mouth slightly opened"
    Antonyms: closed, shut, blinking, winking, compressed, tight, squinched, squinting
  6. open - not having been filled; "the job is still open"
    unavailable (indirect, via available)
  7. open - accessible to all; "open season"; "an open economy"
    restricted (indirect, via unrestricted)
  8. assailable, undefendable, undefended, open - not defended or capable of being defended; "an open city"; "open to attack"
    Antonym: invulnerable (indirect, via vulnerable)
  9. loose, open - (of textures) full of small openings or gaps; "an open texture"; "a loose weave"
    Antonym: fine (indirect, via coarse)
  10. open - having no protecting cover or enclosure; "an open boat"; "an open fire"; "open sports cars"
    enclosed (indirect, via unenclosed)
  11. open - opened out; "an open newspaper"
    folded (indirect, via unfolded)
  12. open - 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
  13. 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"
    Antonym: settled (indirect, via unsettled)
  14. open, opened - not sealed or having been unsealed; "the letter was already open"; "the opened package lay on the table"
    Antonym: sealed (indirect, via unsealed)
  15. open - without undue constriction as from e.g. tenseness or inhibition; "the clarity and resonance of an open tone"; "her natural and open response"
    constricted (indirect, via unconstricted)
  16. open - 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"
    full (indirect, via empty)
  17. overt, open - open and observable; not secret or hidden; "an overt lie"; "overt hostility"; "overt intelligence gathering"
  18. unstopped, open - used of string or hole or pipe of instruments
  19. open - not requiring union membership; "an open shop employs nonunion workers"
    union (indirect, via nonunion)
  20. 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"
    Antonyms: unsusceptible, insusceptible (indirect, via susceptible)
  21. open - not secret; "open plans"; "an open ballot"
    concealed (indirect, via unconcealed)
  22. blatant, blazing, conspicuous, open - 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"
    Antonym: concealed (indirect, via unconcealed)
  23. clear, open - affording free passage or view; "a clear view"; "a clear path to victory"
    Antonym: obstructed (indirect, via unobstructed)
  24. open, wide-open, lawless - lax in enforcing laws; "an open town"
    Antonym: lawful (indirect, via unlawful)
  25. 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"
    Antonyms: disingenuous, artful (indirect, via ingenuous)
  26. open - sincere and free of reserve in expression; "Please be open with me"
    dishonest, dishonorable (indirect, via honest)
  27. open - receptive to new ideas; "an open mind"; "open to new ideas"
    prejudiced, discriminatory (indirect, via unprejudiced)
  28. open - ready for business; "the stores are open"
    inactive (indirect, via active)
Noun open has 4 senses
  1. open, clear - a clear or unobstructed space or expanse of land or water; "finally broke out of the forest into the open"
    --1 is a kind of area, country
  2. 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"
    --2 is a kind of outside, exterior
  3. open - a tournament in which both professionals and amateurs may play
    --3 is a kind of
    tournament, tourney
  4. open, surface - information that has become public; "all the reports were out in the open"; "the facts had been brought to the surface"
    --4 is a kind of public knowledge, general knowledge
    Derived form: verb open10
Verb open has 11 senses
  1. open, open up - cause to open or to become open; "Mary opened the car door"
    Antonyms: close, shut
    Derived forms: noun opener2, noun opener3, noun opening3, noun opening5
    Sample sentence:
    They want to open the doors
  2. open, open up - start to operate or function or cause to start operating or functioning; "open a business"
    Antonyms: close, fold, shut down, close down
    Derived forms: noun opening2, noun opening12
    Sample sentence:
    The business is going to open
  3. open, open up - become open; "The door opened"
    --3 is one way to change state, turn
    Antonyms: close, shut
    Derived form: noun opening3
    Sample sentence:
    The doors open
  4. open - begin or set in action, of meetings, speeches, recitals, etc.; "He opened the meeting with a long speech"
    --4 is one way to
    start, start up, embark on, commence
    Antonyms: close
    Derived forms: noun opener1, noun opening2, noun opening12
    Sample sentences:
    Somebody ----s something
    Something ----s something
  5. unfold, spread, spread out, open - spread out or open from a closed or folded state; "open the map"; "spread your arms"
    --5 is one way to undo
    Derived form: noun opening3
    Sample sentences:
    Somebody ----s something
    Somebody ----s something PP
  6. open, open up - make available; "This opens up new possibilities"
    --6 is one way to yield, give, afford
    Derived form: noun opening6
    Sample sentences:
    Somebody ----s something
    Something ----s something
  7. open, open up - become available; "an opportunity opened up"
    --7 is one way to arise, come up
    Derived form: noun opening6
    Sample sentence:
    Something ----s
  8. open - have an opening or passage or outlet; "The bedrooms open into the hall"
    Derived forms: noun opening1, noun opening9, noun opening11
    Sample sentence:
    Something is ----ing PP
  9. open - make the opening move; "Kasparov opened with a standard opening"
    --9 is one way to
    move, go
    Derived form: noun opening12
    Sample sentence:
    Somebody ----s
  10. afford, open, give - afford access to; "the door opens to the patio"; "The French doors give onto a terrace"
    Derived forms: noun open4, noun opening9
    Sample sentence:
    Something is ----ing PP
  11. open - display the contents of a file or start an application as on a computer
    --11 is one way to
    expose, exhibit, display
    Antonyms: close
    Sample sentence:
    Somebody ----s something
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