The word viability is built upon the Latin root vīta, meaning "life," which itself descends from the Proto-Indo-European root gʷei̯h₃-, meaning "to live." This ancient root is the source for a vast family of life-related words across Indo-European languages, including English vital and vitamin. The suffix -ability, indicating a state or capacity, was attached in English, combining the Latin-derived adjective-forming -able with the noun-forming -ity. Thus, the literal construction "life-capacity" evolved into the modern abstract meaning, denoting the capability of something—be it an idea, a plan, or an organism—to sustain life or function successfully.

Structure: vi (life) + ability (capacity) - vi: From Latin vīta (life). This root conveys the core concept of life or living. - ability: From Latin -abilitās, a suffix forming nouns indicating capacity or fitness. It is built on the adjective-forming suffix -abilis (able to be).