/ səbˈstænʃieɪt; NAmE / verb
[ vn ] ( formal ) to provide information or evidence to prove that sth is true :
The results of the tests substantiated his claims.
► sub·stan·ti·ation / səbˌstænʃiˈeɪʃn; NAmE / noun [ U ]
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WORD ORIGIN
mid 17th cent.: from medieval Latin substantiat- given substance, from the verb substantiare .