Definition of counter- in English:

counter-

prefix

  • 1Denoting opposition, retaliation, or rivalry.

    ‘counter-attack’
    ‘counter-espionage’
    1. 1.1 Denoting movement or effect in the opposite direction.
      ‘counterpoise’
    2. 1.2 Denoting correspondence, duplication, or substitution.
      ‘counterpart’

Origin

From Anglo-Norman French countre-, Old French contre, from Latin contra ‘against’.

Pronunciation

counter-

/ˈkaʊntə/