gradually

from WordNet (r) 3.0 (2006)

gradually
    adv 1: in a gradual manner; "the snake moved gradually toward
           its victim" [syn: {gradually}, {bit by bit}, {step by
           step}]

from The Collaborative International Dictionary of English v.0.48

Gradually \Grad"u*al*ly\, adv.
   1. In a gradual manner.
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   2. In degree. [Obs.]
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            Human reason doth not only gradually, but
            specifically, differ from the fantastic reason of
            brutes.                               --Grew.
      [1913 Webster]