Definition from Wiktionary, the free dictionary
- To affirm to be correct, true, or genuine.
- When will the appraiser attest the date of the painting?
- To certify by signature or oath
- You must attest your will in order for it to be valid.
- To certify in an official capacity.
- To supply or be evidence of
- Will her fine work attest her ability.
- 1992, Rudolf M. Schuster, The Hepaticae and Anthocerotae of North America: East of the Hundredth Meridian, volume V, page viii
- The supplementary bibliography (in Vol. VI) attests to the comprehensiveness of the effort.
- 1599 — Shakespeare, Henry V Prologue (First Folio edition)
- O pardon : since a crooked Figure may / Attest in little place a Million, / And let us, Cyphers to this great Accompt, / On your imaginarie Forces worke.
- To put under oath.
Derived terms 
to affirm to be correct, true, or genuine
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See also 
- attest in Webster’s Revised Unabridged Dictionary, G. & C. Merriam, 1913
- attest in The Century Dictionary, The Century Co., New York, 1911
- attest at OneLook Dictionary Search
Declension of attest