open
adjective
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not requiring union membership
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ready for business“the stores are open”
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not having been filled“the job is still open”
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openly straightforward and direct without reserve or secretivenesscandidheart-to-heart
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without undue constriction as from e.g. tenseness or inhibition“the clarity and resonance of an open tone”
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affording free passage or viewclear
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affording unobstructed entrance and exitunfastened
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affording free passage or access“open drains”
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used of mouth or eyes“keep your eyes open”opened
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having no protecting cover or enclosure“an open boat”
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(set theory) of an interval that contains neither of its endpoints
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open and observableovert
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open to or in view of all“an open protest”
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with no protection or shieldexposed
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ready or willing to receive favorablyreceptive
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accessible to all“open season”unrestrictedunexclusive
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not sealed or having been unsealed“the letter was already open”opened
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not brought to a conclusionundecidedundeterminedunresolved
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(of textures) full of small openings or gaps“an open texture”loose
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possibly accepting or permittingcapablesubject
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not defended or capable of being defended“an open city”assailableundefendableundefended
noun
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information that has become public“all the reports were out in the open”surface
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a tournament in which both professionals and amateurs may play
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where the air is unconfinedoutdoors
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a clear or unobstructed space or expanse of land or water“finally broke out of the forest into the open”clear
verb
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make available“This opens up new possibilities”offer
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become available“an opportunity opened up”open up
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make the opening move“Kasparov opened with a standard opening”
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cause to open or to become open“Mary opened the car door”open up
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become open“The door opened”open up
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spread out or open from a closed or folded state“open the map”spreadunfoldspread out
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display the contents of a file or start an application as on a computer
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afford access to“the door opens to the patio”give
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used of meetings, speeches, etc., to begin or set in action“The chairperson opened the meeting with a long speech.”
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start to operate or function or cause to start operating or functioning“open a business”open up
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have an opening or passage or outlet“The bedrooms open into the hall”