infinitive
n. US //ˌɪnˈfɪnɪtɪv// UK //ɪnfˈɪnɪtˌɪv// in·fini·tive
From Middle English infenitife (“without end, in perpetuity”), from Late Latin īnfīnītīvus (“unlimited, indefinite”), from Latin īnfīnītus (“unlimited, infinite”). By surface analysis, infinite + -ive.