Origin: 1400–50;late Middle Englishprobat < Latinprobātum a thing approved, noun use of neuter past participle of probāre to test and find good; see probe, -ate1
"official proving of a will," 1463, from L. probatum "a thing proved," neut. of probatus, pp. of probare "to try, test, prove" (see prove). The verb is recorded from 1792.