Noun
1. a particular environment or surrounding influence;
"there was an atmosphere of excitement"2. a unit of pressure: the pressure that will support a column of mercury 760 mm high at sea level and 0 degrees centigrade
3. the mass of air surrounding the Earth;
"there was great heat as the comet entered the atmosphere""it was exposed to the air"4. the weather or climate at some place;
"the atmosphere was thick with fog"5. the envelope of gases surrounding any celestial body
6. a distinctive but intangible quality surrounding a person or thing;
"an air of mystery""the house had a neglected air""an atmosphere of defeat pervaded the candidate's headquarters""the place had an aura of romance"