Definition of portional in English:

portional

Pronunciation /ˈpɔːʃ(ə)n(ə)l/

adjective

rare
  • Belonging or relating to a part; forming a portion; partial.

Origin

Late Middle English; earliest use found in The Wycliffite Bible (early version). From post-classical Latin portionalis partial, of a part (Vetus Latina) from classical Latin portiōn-, portiō + -ālis.