surroundings

noun

1. The area surrounding someone or something, together with the objects and circumstances in the vicinity; the environment or ambiance.

   “His tall, gaunt, stringy figure is insensible to fatigue, and his dry, half-sarcastic, and often wholly unsympathetic manner is uninfluenced by any change in his surroundings.”

   “We like the way they live, in their penthouselike surroundings filled with fake ferns and goldfish.”

2. All parts of the universe that are not within the thermodynamic system of interest.