Know how to use "fewer" and "less"? Find out.
1530s, "subject to dispensation," from Medieval Latin dispensabilis, from dispensare (see dispense). Meaning "that can be done without" is from 1640s. Related: Dispensability.
dispensable dis·pen·sa·ble (dĭ-spěn'sə-bəl)adj. Capable of being dispensed, administered, or distributed. Used of a drug.