ambient (adj.)

1590s, "surrounding, encircling," from Latin ambientem (nominative ambiens) "a going around," present participle of ambire "to go around, go about," from amb- "around" (from PIE root *ambhi- "around") + ire "go" (from PIE root *ei- "to go"). The notion of "going all around" led to the sense of "encircling, lying all around."