substantiative
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| Adj. | 1. | substantiative - serving to support or corroborate; "collateral evidence" corroborative, corroboratory, substantiating, validating, validatory, verificatory, verifying, confirmative, confirmatory, confirming, collateral supportive - furnishing support or assistance; "a supportive family network"; "his family was supportive of his attempts to be a writer" |