ambient (adj.)youdaoicibaDictYouDict[ambient 词源字典]
1590s, "surrounding, encircling," from Latin ambientem (nominative ambiens) "going round," present participle of ambire "to go around," from amb- "around" (see ambi-) + ire "go" (see ion). The ground sense of "revolving" led to "encircling, lying all around."[ambient etymology, ambient origin, 英语词源]