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English definition of “valid”

valid

adjective  /ˈvæl·ɪd/ us  
based on truth or reason; able to be accepted: The money was gone, and the only valid conclusion was that someone had stolen it. A valid document is legally acceptable, usually because it has been done according to official rules: You must have a valid driver’s license to drive a car.
validity
noun [U]  /vəˈlɪd·ɪ·t̬i/ us  
Some experts questioned the validity of the president’s ideas.
validly
adverb /ˈvæl·ɪd·li/
(Definition of valid from the Cambridge Academic Content Dictionary © Cambridge University Press)
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