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English definition of “attest”

attest

verb [I or T] uk   /əˈtest/ formal us  
to show something or to say or prove that something is true: Thousands of people came out onto the streets to attest their support for the democratic opposition party. The number of old German cars still on the road attests (to) the excellence of their manufacture. As his career attests, he is a cricketer of world-class standard.specialized The will needs to be attested (= officially marked to show that the signature of the person who made the will is correct) by three witnesses.Showing and demonstratingProving and disproving
(Definition of attest from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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