Definition of opposant in US English:

opposant

noun

rare
  • Opponent. In later use: (Canadian Law) a person contesting a matter before a judge or court.

Origin

Late 15th century; earliest use found in William Caxton (1415x24–1492), printer, merchant, and diplomat. From French opposant, use as noun of present participle of opposer oppose; compare -ant.

Pronunciation

opposant

/əˈpəʊz(ə)nt/