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1. The quality of being valid and rigorous
   - cogency, rigor [US], rigour [Brit, Cdn]
    
2. The quality of having legal force or effectiveness
   - validness
    
3. The property of being strong and healthy in constitution
   - robustness, hardiness, lustiness

Derived forms: validities

See also: valid

Type of: believability, credibility, credibleness, legality, strength

Encyclopedia: Validity