WordWeb Online

1. Cause to open or to become open
   "Mary opened the car door"
   - open up
    
2. Start to operate or function or cause to start operating or functioning
   "open a business"
   - open up
    
3. Become open
   "The door opened"
   - open up
    
4. Begin or set in action, of meetings, speeches, recitals, etc.
   "He opened the meeting with a long speech"
    
5. Spread out or open from a closed or folded state
   "open the map"
   - unfold, spread, spread out
    
6. Make available
   "This opens up new possibilities"
   - open up
    
7. Become available
   "an opportunity opened up"
   - 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"
    - afford, give
     
11. Display the contents of a file or start an application as on a computer

1. Affording unobstructed entrance and exit; not shut or closed
   "an open door"; "they left the door open"
   - unfastened
    
2. Affording free passage or access
   "open drains"; "the road is open to traffic"; "open ranks"
    
3. With no protection or shield
   "open to the weather"; "an open wound"
   - 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"
   - opened
    
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"
   - assailable, undefendable, undefended
    
9. (of textures) full of small openings or gaps
   "an open texture"
   - 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
     
12. Not brought to a conclusion; subject to further thought
    "an open question"
    - undecided, undetermined, unresolved
     
13. Not sealed or having been unsealed
    "the letter was already open"
    - 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 favourably
    - receptive
     
16. Open and observable; not secret or hidden
    "open ballots"
    - overt
     
17. Not requiring union membership
    "an open shop employs nonunion workers"
     
18. Possibly accepting or permitting
    "open to interpretation"; "an issue open to question"
    - capable, subject
     
19. Affording free passage or view
    "open waters"; "the open countryside"
    - clear
     
20. Openly straightforward and direct without reserve or secretiveness
    "an open and trusting nature"
    - candid, heart-to-heart
     
21. Ready for business
    "the stores are open"

1. A clear or unobstructed space or expanse of land or water
   "finally broke out of the forest into the open"
   - clear
    
2. Where the air is unconfined
   "the concert was held in the open air"; "camping in the open"
   - 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"
   - surface

Derived forms: opens, opening, opener, opened, openest

See also: acceptant, acceptive, active, admissive, agape, agaze, ajar, artless, assimilative, available, bald, barefaced, coarse, explicit, expressed, gaping, harsh, hospitable, ingenuous, naked, nonunion, open up, opened, opener, opening, openly, openness, public, raw, staring, susceptible, unconcealed, unconstricted, undisguised, unenclosed, unobstructed, unprotected, unrestricted, unsealed, unsettled, unstoppered, visible, vulnerable, wide, wide-eyed, wide-open, yawning

Type of: afford, area, arise, change state, come up, commence, country, display, embark on, exhibit, expose, exterior, general knowledge, give, go, move, outside, public knowledge, start, start up, tournament, tourney [N. Amer], turn, undo, yield

Antonym: close, closed, shut

Encyclopedia: Open, Again Open Open, sesame Open, closed, open