usurpingly🔊advEtymology From usurping + -ly.1Archaic, Poetic So as to usurp.The fever’d diadem on my brow I claim’d and won usurpingly —— Hath not the same fierce heirdom given Rome to the Caesar — this to me?1829, Edgar Allan Poe, “Tamerlane”, in Al Aaraaf, Tamerlane and Minor Poems: