atmosphere

at‧mo‧sphere

1 [uncountable and countable] the feeling that an event or place gives you:

The hotel had a lovely relaxed atmosphere.

The atmosphere at home was rather tense.

atmosphere of

An atmosphere of optimism dominated the conference.

2 [uncountable] if a place or event has atmosphere, it is interesting:

The castle was centuries old and full of atmosphere.

The match was lacking in atmosphere.

3

 the atmosphere

the mixture of gases that surrounds the Earth

4 [countable] the mixture of gases that surround a planet

5 [countable usually singular] the air inside a room:

a smoky atmosphere

The club has a great atmosphere.

The atmosphere of the region is by polluted by radioactivity