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English definition of “substantiate”

substantiate

verb [T] uk   /səbˈstæn.ʃi.eɪt/ formal us  
to show something to be true, or to support a claim with facts: We have evidence to substantiate the allegations against him. Reports that children had been hurt have not been substantiated.
substantiation
noun [U] uk   /səbˌstæn.ʃiˈeɪ.ʃən/ formal us  
The company produced receipts in substantiation of (= to support) its claim.
(Definition of substantiate from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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