atmosphere

noun

1. (countable, uncountable)The gases surrounding the Earth or any astronomical body.

   “To most people, the huge ice sheets of Antarctica and Greenland are merely water that once was snow. To glaciologists and climatologists, they are storehouses of the Earth's former atmospheres.”

   “Earth is surrounded by a magnetosphere — an invisible bubble of magnetism generated by the powerful churning of molten metals at Earth’s core. It prevents our atmosphere from being stripped away by solar winds blasting it from the sun. While the magnetosphere has been a constant presence for billions of years, its strength waxes and wanes over time.”

2. (countable, uncountable)The air in a particular place.

   “The last hue of crimson had died away in the west, and the depth of the rich purple atmosphere was unbroken.”

   “Thus the red damask curtains which now shut out the fog-laden, drizzling atmosphere of the Marylebone Road, had cost a mere song, and yet they might have been warranted to last another thirty years. A great bargain also had been the excellent Axminster carpet which covered the floor;[…].”

   “This year of 1905 also saw the completion of the electrification of the Underground, which certainly improved the atmosphere, and made travelling easier and more comfortable, although, at first, not too reliable.”

3. (countable, figuratively, uncountable)The conditions (such as music, illumination etc.) that can influence the mood felt in an environment.
4. (countable, figuratively, uncountable)The apparent mood felt in an environment.

   “The atmosphere for the football match was great.”

   “For by the hearth the children sit ⁠Cold in that atmosphere of Death, ⁠And scarce endure to draw the breath, Or like to noiseless phantoms flit: […]”

   “Oh, what an atmosphere / I love a party with a happy atmosphere”

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

   “A process for preparing normally solid high molecular weight, hydrocarbon polymers which comprises heating and reacting carbon monoxide with hydrogen at a temperature of 125 ° to 350 °C, under a pressure of at least 30 atmospheres and in contact with a phosphomolybdic compound represented by the formula P₂Mo_(20–24)O_(2–60).”

6. (uncountable)Extras in a scene who have no spoken lines.

   “Central Casting is in the business of extras, also known as atmosphere or background actors […]”

   “"It is estimated conservatively that there are some 50,000 would-be film extras in and around the celluloid capital, persons who would jump at the opportunity to appear as atmosphere in pictures," Scott concluded.”

   “By the way, I discovered that we were not extras but background, as far as the director was concerned; and for the producer, we were atmosphere.”

name

1. (Internet)The distributed social media network of federated services using the AT Protocol.

   “In the ATmosphere, you don't have to make a tradeoff. You can use the service which has better moderation and still reach the accounts you want, even if they host their account somewhere else and agreed to some other TOS than you.”