Definitions

from The American Heritage® Dictionary of the English Language, 4th Edition

  • Opposite: antimere.
  • Opposing; against: antiapartheid.
  • Counteracting; neutralizing: antacid.
  • Destroying: antiaircraft.
  • Inverse: antilogarithm.
  • Displaying opposite characteristics: antihero.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • Against, hostile to.
  • Opposite of, reverse.
  • Counteracting, neutralizing.
  • Related to antiparticles.

Etymologies

Greek, from anti, opposite.
(American Heritage® Dictionary of the English Language, Fourth Edition)
From Ancient Greek ἀντί (anti, "against"). (Wiktionary)

Examples

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