The Collaborative International Dictionary of English v.0.48:

Materially \Ma*te"ri*al*ly\, adv.
   1. In the state of matter.
      [1913 Webster]

            I do not mean that anything is separable from a body
            by fire that was not materially preexistent in it.
                                                  --Boyle.
      [1913 Webster]

   2. In its essence; substantially.
      [1913 Webster]

            An ill intention is certainly sufficient to spoil .
            . . an act in itself materially good. --South.
      [1913 Webster]

   3. In an important manner or degree; essentially; as, it
      materially concerns us to know the real motives of our
      actions.
      [1913 Webster]

WordNet (r) 3.0 (2006):

materially
    adv 1: with respect to material aspects; "psychologically
           similar but materially different"
    2: to a significant degree; "it aided him materially in winning
       the argument"