grad·u·al /ˈgræʤəwəl, ʤəl, ˈgræʤwəl/
  (a.)逐漸的,漸增的,徐徐的讚美詩
  Grad·u·al a.  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.
  Creatures animate with gradual life
  Of growth, sense, reason, all summed up in man.   --Milton.
  Grad·u·al, n.
  1. R. C. Ch. (a) An antiphon or responsory after the epistle, in the Mass, which was sung on the steps, or while the deacon ascended the steps. (b) A service book containing the musical portions of the Mass.
  2. A series of steps. [Obs.]
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  gradual
       adj 1: proceeding in small stages; "a gradual increase in prices"
              [ant: sudden]
       2: of a topographical gradient; not steep or abrupt; "a gradual
          slope" [ant: steep]
       n : (Roman Catholic Church) an antiphon (usually from the Book
           of Psalms) immediately after the epistle at Mass