GNU Collaborative International Dictionary of English

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Found one definition

1.       
   Substantiate (?), v. t. [imp. & p. p. Substantiated (?); p. pr. & vb. n. Substantiating.]
   1. To make to exist; to make real.  Ayliffe.
   
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   2. To establish the existence or truth of by proof or competent evidence; to verify; as, “to substantiate a charge or allegation; to substantiate a declaration”.
   
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   Observation is, in turn, wanted to direct and substantiate the course of experiment. Coleridge.
   
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