Additional proof that something that was believed (some fact or hypothesis or theory) is correct.

synonyms: check, confirmation, substantiation.

Roget 771: security; guaranty, guarantee; gage, warranty, bond, tie, pledge, plight, mortgage, collateral, debenture, hypothecation, bill of sale, lien, pawn, pignoration^†; real security; vadium^†.    stake, deposit, earnest, handsel, caution.    promissory note; bill, bill of exchange; I.   O.U.; personal security, covenant, specialty; parole etc. (promise) 768.    acceptance, indorsement^†, signature, execution, stamp, seal.    sponsor, cosponsor, sponsion^†, sponsorship; surety, bail; mainpernor^†, hostage; godchild, godfather, godmother.    recognizance; deed of indemnity, covenant of indemnity.    authentication, verification, warrant, certificate, voucher, docket, doquet^†; record etc. 551; probate, attested copy.    receipt; acquittance, quittance; discharge, release.    muniment^†, title deed, instrument; deed, deed poll; assurance, indenture; charter etc. (compact) 769; charter poll; paper, parchment, settlement, will, testament, last will and testament, codicil.    ... show more

Roget 463: experiment; essay etc. (attempt) 675; analysis etc. (investigation) 461; screen; trial, tentative method, t=atonnement.    verification, probation, experimentum crucis [Lat.], proof, (demonstration) 478; criterion, diagnostic, test, probe, crucial test, acid test, litmus test.    crucible, reagent, check, touchstone, pix^†; assay, ordeal; ring; litmus paper, curcuma paper^†, turmeric paper; test tube; analytical instruments etc. 633.    empiricism, rule of thumb.    feeler; trial balloon, pilot balloon, messenger balloon; pilot engine; scout; straw to show the wind.    speculation, random shot, leap in the dark.    analyzer, analyst, assayist^†; adventurer; experimenter, experimentist^†, experimentalist; scientist, engineer, technician.    subject, experimentee^†, guinea pig, experimental animal.    [experimental method] protocol, experimental method, blind experiment, double-blind experiment, controlled experiment.    poll, survey, opinion poll.    epidemiological survey [Med.], retrospective analysis, retrospective survey, prospective survey, prospective analysis; statistical analysis.    literature search, library research.    tryout, audition.    [results of experiment] discovery etc. 480; measurement etc. 466; evidence etc. 467.    [reasoning about an experiment] deduction, induction, abduction.    ... show more

Dutch: bewijs, verificatie, contra-expertise
Polish: weryfikacja

law An affidavit attached to a statement confirming the truth of that statement.