open

cause to open or to become open

• “Mary opened the car door”

start to operate or function or cause to start operating or functioning

• “open a business”

become open

• “The door opened”

begin or set in action, of meetings, speeches, recitals, etc.

• “He opened the meeting with a long speech”

spread out or open from a closed or folded state

• “open the map”
• “spread your arms”

make available

• “This opens up new possibilities”

become available

• “an opportunity opened up”

have an opening or passage or outlet

• “The bedrooms open into the hall”

make the opening move

• “Kasparov opened with a standard opening”

afford access to

• “the door opens to the patio”
• “The French doors give onto a terrace”

display the contents of a file or start an application as on a computer

affording unobstructed entrance and exit; not shut or closed

• “an open door”
• “they left the door open”

affording free passage or access

• “open drains”
• “the road is open to traffic”
• “open ranks”

with no protection or shield

• “the exposed northeast frontier”
• “open to the weather”
• “an open wound”

open to or in view of all

• “an open protest”
• “an open letter to the editor”

used of mouth or eyes

• “keep your eyes open”
• “his mouth slightly opened”

not having been filled

• “the job is still open”

accessible to all

• “open season”
• “an open economy”

not defended or capable of being defended

• “an open city”
• “open to attack”

(of textures) full of small openings or gaps

• “an open texture”
• “a loose weave”

having no protecting cover or enclosure

• “an open boat”
• “an open fire”
• “open sports cars”

opened out

• “an open newspaper”

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

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”

not sealed or having been unsealed

• “the letter was already open”
• “the opened package lay on the table”

without undue constriction as from e.g. tenseness or inhibition

• “the clarity and resonance of an open tone”
• “her natural and open response”

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”

open and observable; not secret or hidden

• “an overt lie”
• “overt hostility”
• “overt intelligence gathering”
• “open ballots”

used of string or hole or pipe of instruments

not requiring union membership

• “an open shop employs nonunion workers”

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”

not secret

• “open plans”
• “an open ballot”

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”

affording free passage or view

• “a clear view”
• “a clear path to victory”
• “open waters”
• “the open countryside”

lax in enforcing laws

• “an open town”

openly straightforward and direct without reserve or secretiveness

• “his candid eyes”
• “an open and trusting nature”
• “a heart-to-heart talk”

sincere and free of reserve in expression

• “Please be open with me”

receptive to new ideas

• “an open mind”
• “open to new ideas”

ready for business

• “the stores are open”

a clear or unobstructed space or expanse of land or water

• “finally broke out of the forest into the 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”

a tournament in which both professionals and amateurs may play

information that has become public

• “all the reports were out in the open”
• “the facts had been brought to the surface”