marginally

from WordNet (r) 3.0 (2006)

marginally
    adv 1: in a marginal manner; "marginally interesting"

from The Collaborative International Dictionary of English v.0.48

Marginally \Mar"gin*al*ly\, adv.
   1. In the margin of a book.
      [1913 Webster]

   2. In a {marginal}[3] manner; barely sufficiently; almost
      not; as, marginally useful.
      [PJC]

from Jargon File (4.4.4, 14 Aug 2003)

marginally
 adv.

   Slightly. "The ravs here are only marginally better than at Small
   Eating Place." See {epsilon}.

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