whenas /ˈwɛnaz/conjunction 2adverb 1 conjunction2 •(no longer used) When. •(no longer used) Whereas. adverb1 •(no longer used) When; at the time (which).Tho, when-as all things ready were aright, / The Damzel was before the Altar set, / Being already dead with fearful fright. — 1596