atmosphere Definition in the Cambridge English Dictionary
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Definition of “atmosphere” - English Dictionary

Definition of "atmosphere" - American English Dictionary

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atmospherenoun

 us   /ˈæt·məˌsfɪər/

atmosphere noun (AIR)

earth science [C usually sing] the ​mixture of ​gases that ​surrounds some ​planets, such as the ​earth; the ​air

atmosphere noun (MEASUREMENT)

science [C] a ​unit for ​measuringpressure

atmosphere noun (CHARACTER)

[U] the ​character or ​mood of a ​place or ​situation: The ​clubprovided a ​relaxed and ​friendly atmosphere for ​itsmembers. literature [U] Atmosphere is also the ​mood or ​feelingproduced by a ​work of ​literature.
(Definition of atmosphere from the Cambridge Academic Content Dictionary © Cambridge University Press)

Definition of "atmosphere" - British English Dictionary

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atmospherenoun

uk   /ˈæt.mə.sfɪər/  us   /-sfɪr/

atmosphere noun (AIR)

the atmosphere B2 [S] the ​mixture of ​gases around the ​earth: These ​factories are ​releasingtoxicgases into the atmosphere. [C] a ​mixture of ​gases that ​surrounds any ​planet: the ​search for ​planets with a ​breathable atmosphereB2 [S] the ​air that you ​breathe in a ​place: The atmosphere in the ​room was so ​stuffy I could ​hardlybreathe. A few ​plants in an ​office will ​improve the atmosphere.

atmosphere noun (MOOD)

B1 [S] the ​character, ​feeling, or ​mood of a ​place or ​situation: There's a very ​relaxed atmosphere in ​ouroffice. There has been an atmosphere ofgloom in the ​factory since it was ​announced that it would be ​closing. [U] approving a ​feeling that a ​place has of being ​pleasant and ​interesting or ​exciting: You ​want a ​restaurant that ​serves good ​food but has a little atmosphere too. He put on some ​softmusic and ​turned the ​lights down in ​order to give the ​room a little more atmosphere.
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(Definition of atmosphere from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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