Toward the back or rear; backward; rearward; regressively.On or at the back; behind; from behind.Away; aloof.Ago: as, “eight days aback,” Ross.Nautical, in or into the condition of receiving the wind from ahead; with the wind acting on the forward side: said of a ship or of her sails.Figuratively, suddenly or unexpectedly checked, confounded, or disappointed: as, he was quite taken aback when he was refused admittance.n. An abacus, or something resembling one, as a flat, square stone, or a square compartment.All aback (