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Yahoo: Opinion - Cutting federal naloxone funding is cruel and will prove costly Opinion - Cutting federal naloxone funding is cruel and will prove costly The Hill: Cutting federal naloxone funding is cruel and will prove costly MSN: Opinion: Cutting federal naloxone funding is cruel and will prove costly The meaning of PROVE is to establish the existence, truth, or validity of (as by evidence or logic). How to use prove in a sentence. proved or proven?: Usage Guide

Define prove. prove synonyms, prove pronunciation, prove translation, English dictionary definition of prove. v. proved , proved or prov en , prov ing , proves v. tr. 1. a. To establish the truth or validity of by the presentation of argument or evidence: The novel... prove (third-person singular simple present proves, present participle proving, simple past proved, past participle proved or proven) (transitive) To demonstrate that something is true or viable; to give proof for; to bear out; to testify.