at·mos·phereˈatməsˌfir/noun1.the envelope of gases surrounding the earth or another planet."part of the sun's energy is absorbed by the earth's atmosphere"synonyms:air, aerospace; More2.the pervading tone or mood of a place, situation, or work of art."the hotel is famous for its friendly, welcoming atmosphere"synonyms:ambience, air, mood, feel, feeling, character, tone, tenor, aura, quality,undercurrent, flavor; informalvibe"the hotel has a relaxed atmosphere"