: a feeling or mood associated with a particular place, person, or thing : atmosphere The restaurant's soft music and candlelight gave it a romantic ambience.
Here is my explanation:
You can say "I like the ambience of this place", it means I like the atmosphere. It could be a club or a bar underground with special music and decor. Or it could be an opening in the forest, where you can hear birds or the wind in the trees. It can be natural or artificial. You can have a creepy ambience in a horror movie. You can have a spiritual ambience in a monastic setting like a church, temple or shrine.
Here is the adjective:
Definition of ambient
1 : existing or present on all sides : encompassing the ambient air temperature ambient light ambient sound
2 : of or relating to ambient music
So ambient is a little different. It means something on all sides. We use it in relation to the weather mostly, but like ambience it is connected with the atmosphere.
Finally, don't forget we also have a genre of music named after this word. Ambient is a type of music like pop, rock or classical, it has its own style. Listen to some of my favourite ambience I discovered late last night. Let me know if you like it.