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substantiate (v.)

1650s, "to make real, to give substance to," from Modern Latin substantiatus, past participle of substantiare, from Latin substantia "being, essence, material" (see substance). Meaning "to demonstrate or prove" is attested from 1803. Related: Substantiated; substantiating.

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Definitions of substantiate from WordNet

substantiate (v.)
establish or strengthen as with new evidence or facts;
substantiate (v.)
represent in bodily form;
The painting substantiates the feelings of the artist
Synonyms: incarnate / body forth / embody
substantiate (v.)
make real or concrete; give reality or substance to;
our ideas must be substantiated into actions
substantiate (v.)
solidify, firm, or strengthen;
The president's trip will substantiate good relations with the former enemy country
From wordnet.princeton.edu