Definition of contra- in English:

contra-

Pronunciation /ˈkɒntrə/

prefix

  • 1Against; opposite; contrasting.

    ‘contraflow’
    • ‘contradict’
    • ‘contralateral’
  • 2Music
    (of instruments or organ stops) pitched an octave below.

    ‘contrabass’
    • ‘contralto’

Origin

From Latin contra ‘against’.