GNU Collaborative International Dictionary of English
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Found one definition
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Substantiate (?), v. t. [imp. & p. p. Substantiated (?); p. pr. & vb. n. Substantiating.]
1. To make to exist; to make real. Ayliffe.
[1913 Webster]
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”.
[1913 Webster]
Observation is, in turn, wanted to direct and substantiate the course of experiment. Coleridge.
[1913 Webster]