Ambience refers to a certain atmosphere or factors of an environment. People often refer to calm, relaxing atmosphere as being ambient but it the general definition ambience refers to many aspects of an environment. It can also mean to surround. It is not common for a person to be referred to as ambient but perhaps this can be interpreted as calm and relaxed.
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Ambient language just refers to the native language a child is learning. They're synonymous. You'll see "ambient" used more in the research literature.