Definition of counter- in English:

counter-

Pronunciation: /ˈkaʊntə/

prefix

1Denoting opposition, retaliation, or rivalry: counter-attack counter-espionage
1.1Denoting movement or effect in the opposite direction: counterpoise
1.2Denoting correspondence, duplication, or substitution: counterpart

Origin

from Anglo-Norman French countre-, Old French contre, from Latin contra 'against'.

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