Etymology

substantiate

sub·stan·ti·ate
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Today it means: To verify something by supplying evidence; to authenticate or corroborate. Full definition →

Medieval Latin substantiatus
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The story

  1. Medieval Latin · borrowed fromsubstantiatus“given substance”
  2. English todaysubstantiate

From Medieval Latin substantiatus (“given substance”), from the verb substantiare, first used 1657.

Etymology from Wiktionary, CC BY-SA 4.0.