[ 'kɒntrə ]
■ prefix
1》 against; opposite: contraception.
2》 Music (of instruments or organ stops) pitched an octave below: contrabass.
Origin
from L. contra 'against'.
CONTRA-
Meaning of CONTRA- in English
Concise Oxford English vocab. Сжатый оксфордский словарь английского языка. 2004