An Etymological Dictionary of Astronomy and Astrophysics

Prefix meaning “against, opposite of;” e.g. in
→ anticenter; → anticorrelation; → anticyclone; → antiparticle.

Etymology (EN): L. anti- from Gk. anti “against, opposite, instead of,” from PIE *anti “against”.

Etymology (PE): Pâd- “agaist, contrary to,” from Mid.Pers. pât- “to, at, for, in,” from O.Pers. paity “agaist, back, opposite to, toward, face to face, in front of;” Av. paiti; cf.
Skt. práti “toward, against, again, back, in return, opposite;” Pali pati-; Gk. proti, pros “face to face with, toward, in addition to, near;” PIE *proti.