Definition of ordinant in US English:

ordinant

noun

rare
  • Mathematics. The ordinate of a point.

adjective

rare
  • Of a person or thing: able to order or direct; that orders, arranges, or regulates.

Origin

Late Middle English (in an earlier sense). Either from Middle French ordinant, present participle of ordiner ordain, or from classical Latin ōrdinant-, ōrdināns, present participle of ōrdināre ordain.