Online English Dictionary

validity [noun]

1. the quality of being valid and rigorous

2. the quality of having legal force or effectiveness

3. the property of being strong and healthy in constitution

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noun
soundness, reasonableness, rationality, logic, justifiability, defensibility, sustainability, plausibility, viability, bona fides, effectiveness, cogency, power, credibility, believability, force, strength, weight, foundation, substance, substantiality, authority, reliability

legal acceptability, authenticity, correctness, boan fides, genuineness, lawfulness, legality, legitimacy, binding nature, contractural nature, force, effect, effectiveness