Definition of anti- in English:

anti-

(also ant-)

prefix

  • 1Opposed to; against.

    ‘anti-aircraft’
    1. 1.1 Preventing.
      ‘antibacterial’
    2. 1.2 Relieving.
      ‘antipruritic’
    3. 1.3 The opposite of.
      ‘anticlimax’
      dissenting, dissident, disagreeing, differing, discordant, contradicting, contrary, negative, anti-
      View synonyms
    4. 1.4 Acting as a rival.
      ‘antipope’
    5. 1.5 Unlike the conventional form.
      ‘anti-hero’
  • 2Physics
    The antiparticle of a specified particle.

    ‘antiproton’

Origin

From Greek anti ‘against’.

Pronunciation

anti-

/ˈanti/