gradual

(noun) (Roman Catholic Church) an antiphon (usually from the Book of Psalms) immediately after the epistle at Mass.

(adj) proceeding in small stages. Synonyms: gradual (vs. sudden). Example: "A gradual increase in prices."

(adj) (of a topographical gradient) not steep or abrupt. Synonyms: gradual (vs. steep). Example: "A gradual slope."