1. A claim or assertion that is supported by evidence, facts, or proof; a statement that has been verified or confirmed
The lawyer presented a substantiated claim that the defendant was negligent.
O advogado apresentou uma alegação comprovada de que o réu agiu com negligência.
2. In legal or formal contexts, a claim that has sufficient evidence or documentation to support its validity
The insurance company rejected the claim because it was not substantiated.
A companhia de seguros rejeitou a reclamação porque não foi comprovada.