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English definition of “valid”

valid

adjective uk   /ˈvæl.ɪd/ us  
B2 based on truth or reason; able to be accepted: a valid argument/criticism/reason My way of thinking might be different from yours, but it's equally valid.
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Suitable and acceptableQuite good, or not very good
B2 A ticket or other document is valid if it is based on or used according to a set of official conditions that often include a time limit: My passport is valid for another two years.Allowing and permitting having legal force: Is this contract/ticket/agreement still valid?Legal and illegal
validity
noun [U] uk   /vəˈlɪd.ɪ.ti/ us    /vəˈlɪd.ə.t̬i/
C2 This research seems to give/lend some validity to the theory that the drug might cause cancer.Useful or advantageous
validly
adverb uk   /-li/ us  
Legal and illegal
(Definition of valid from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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