ASCERTAIN Copy link • ASCERTAINmake certain, ostendere: declarare: probare: planum facere atque probare. Anything ascertains the meaning of a word, aliquid satis declarat, quaenam sub voce-subjicienda sit sententia. To ascertain a person of anything, probare alicui aliquid: demonstrare: efficere (establish): vincere: evincere (prove against all opposition). To learn for certain, aliquid comperire: to have ascertained, (pro) certo scire: exploratum habere aliquid or aliquid mihi exploratum est: perspectum planeque cognitum habere.