the word viable entered english in the early 19th century from french 'viable', itself derived from vie ('life'). the french term is built upon the latin root 'vita', meaning 'life', which traces back to the proto-indo-european root 'gʷei̯h₃-', signifying 'to live'. the suffix '-able', from latin '-abilis', denotes capability. thus, the literal construction 'capable of life' logically evolved to describe anything—from a plan to a fetus—that possesses the necessary conditions to live, develop, or succeed.

Structure: vi (life) + able (capable of) vi originates from latin 'vita' meaning 'life'. able is from latin '-abilis', an adjective-forming suffix meaning 'capable of, fit for'.