ambivert (n.)

word-forming element meaning "both, on both sides," from Latin ambi- "around, round about" (before vowels amb-, also sometimes reduced to am-, an-), from PIE root *ambhi- "around," which is probably an ablative plural (*ant-bhi "from both sides") of *ant- "front, forehead."

"turn within, direct inward," 1650s, from Latin intro "inward, within" (see intro-) + vertere "to turn" (from PIE root *wer- (2) "to turn, bend").

mid-15c., in legal case names, denoting action of one party against another, from Latin versus "turned toward or against," past participle of vertere "to turn," from PIE *wert- "to turn, wind," from root *wer- (2) "to turn, bend."