open Meaning in Cambridge American English Dictionary
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Meaning of "open" - American English Dictionary

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openadjective, adverb [not gradable]

 us   /ˈoʊ·pən/

open adjective, adverb [not gradable] (POSITIONED FOR ACCESS)

being in a position that allows things to pass through or that allows for immediate use; not closed or fastened: The window was wide open. The trunk of his car had been pried open.

openadjective

 us   /ˈoʊ·pən/

open adjective (READY FOR USE)

[not gradable] ready to be used or to provide a service: The supermarket is open till 9 p.m.

open adjective (NOT DECIDED)

not decided or certain: I want to keep my options open until I have all the facts. Whether we’ll go is still an open question. You should keep an open mind about your new school (= not form any opinions) until you’ve been there.

open adjective (NOT SECRET)

not secret: Open warfare had broken out in Yugoslavia. A person who is open is honest and not trying to hide something: He is quite open about his weaknesses.

open adjective (NOT COVERED)

not enclosed or covered: The park is one of the city’s largest open spaces.

open adjective (AVAILABLE)

[not gradable] available; not limited: Are there any positions open in the marketing department? This library is open to the general public. Their behavior at these negotiations is open to criticism (= can be criticized). I’m open to (= willing to consider) any reasonable suggestion.
openly
adverb  us   /ˈoʊ·pən·li/
She talked about her cancer quite openly.
openness
noun [U]  us   /ˈoʊ·pən·nəs/
The agency released detailed plans for greater openness and stronger standards in the international marketplace.

openverb [I/T]

 us   /ˈoʊ·pən/

open verb [I/T] (BEGIN)

to begin something or cause it to begin: [T] I would like to open the meeting by asking each of you to introduce yourself. [M] They’re opening up a new restaurant in about a month. [I] The film opens (= will be shown for the first time) next week.

open verb [I/T] (MAKE READY FOR USE)

to become or make something ready to provide a service: [I] The cleaners opens (up) around seven. [T] They opened the exhibit to the public yesterday.
opening
adjective [not gradable]  us   /ˈoʊ·pə·nɪŋ/
He made some opening remarks, then introduced the main speaker.
(Definition of open from the Cambridge Academic Content Dictionary © Cambridge University Press)
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