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English definition of “valid”

valid

adjective     /ˈvæl.ɪd/
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. → Compare invalidSuitable 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     /vəˈlɪd.ɪ.ti/ US  /vəˈlɪd.ə.t̬i/ noun [U] C2 This research seems to give/lend some validity to the theory that the drug might cause cancer.Useful or advantageous validly     /-li/ adverb Legal and illegal
(Definition of valid adjective from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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