gradual
1. grad.u.al \'graj-(*-)w*l, 'graj-*l\ n [fr. its being sung on the steps of the altar] 1: the response and versicle following the Epistle of the Mass 2: a book containing the choral parts of the Mass 2. gradual aj 1: proceeding by steps or degrees 2: moving, changing, or developing by fine, slight, or often imperceptible degrees - grad.u.al.ly av