PIE base ‘front, forehead’, with derivatives meaning ‘in front of, before; end’. See also *ambhi ‘around’ and *ne- ‘not’.
Other derivatives include un-, expressing removal, reversal, or deprivation, anti-, ante-, end, enantiomorph, elope, along, advance, vanguard, and antique.
[Pokorny ant-s, pp. 48–50.]