enfranchise
Pronunciation: /ɪnˈfran(t)ʃʌɪz, ɛn-/
verb

Origin:
late Middle English (formerly also as infranchise): from Old French enfranchiss-, lengthened stem of enfranchir, from en- (expressing a change of state) + franc, franche 'free'

Spelling help
Unlike most verbs ending in -ise, enfranchise cannot be spelled with an -ize ending.