Expressions used in Everyday Spoken English in Social and Professional contexts
Something described as 'viable' is feasible, possible or capable of being used or working correctly. We can talk about 'viable plans' - plans that are likely to be successful, or something that is 'economically viable' or capable of making a profit. When we are talking about plants a 'viable seed' is one that is likely to produce a plant or to germinate. In biology, something 'viable' is able to live or thrive successfully. This is a technical term used more often in professional contexts.