/ ˈvaɪəbl; NAmE / adjective
1.
that can be done; that will be successful
SYN feasible :
a viable option / proposition
There is no viable alternative .
to be commercially / politically / financially / economically viable
2.
( biology ) capable of developing and surviving independently :
viable organisms
► via·bil·ity / ˌvaɪəˈbɪləti; NAmE / noun [ U ]:
commercial viability
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WORD ORIGIN
early 19th cent.: from French , from vie life, from Latin vita .