Proceeding by steps or degrees; advancing, step by step, as in ascent or descent or from one state to another; regularly progressive; slow; as, a gradual increase of knowledge; a gradual decline.(adjective)
source: webster1913
noun (n)
(Roman Catholic Church) an antiphon (usually from the Book of Psalms) immediately after the epistle at Mass(noun.communication)
source: wordnet30
An antiphon or responsory after the epistle, in the Mass, which was sung on the steps, or while the deacon ascended the steps.(noun)