What is the meaning of Atmosphere?

The gases surrounding the Earth or any astronomical body.

The air in a particular place.

The conditions (such as music, illumination etc.) that can influence the mood felt in an environment.

The apparent mood felt in an environment.

A unit of measurement for pressure equal to 101325 Pa (symbol: atm), approximately the atmospheric pressure at sea level.

Extras in a scene who have no spoken lines.

Source: wiktionary.org