Definition of contra- in English:

contra-

Pronunciation: /ˈkɒntrə/

prefix

1Against; opposite: contraception contraflow
2 Music (Of an instrument or organ stop) pitched an octave below: contrabass

Origin

from Latin contra 'against'.

Definition of contra- in:

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Pronunciation: ˌantɪˈbɛləm
adjective
occurring or existing before a particular war…