Mid 17th century (in an earlier sense). From consumption + -al. With sense 1 compare earlier consumptionary, consumptionish, consumptionous, consumptive.
Definition of consumptional in US English:
consumptional
adjectivekənˈsʌm(p)ʃ(ə)n(ə)l
Of, for, or relating to consumption.
Origin
Mid 17th century (in an earlier sense). From consumption + -al. With sense 1 compare earlier consumptionary, consumptionish, consumptionous, consumptive.