Definition of plainant in US English:

plainant

adjective

Law
rare
  • That plains; (Law) = "complainant"rare.

Origin

Late Middle English (in an earlier sense). From Middle French plaignant someone who brings a complaint in court, use as noun of present participle of plaindre. With use as adjective compare earlier plainand.

Pronunciation

plainant

/ˈpleɪnənt/