Wordnet 3.0
ADVERB (1)
1. 
 in accord with physical laws; 
- Example: "it is physically impossible"
The Collaborative International Dictionary of English v.0.48:
Physically \Phys"ic*al*ly\, adv.
   In a physical manner; according to the laws of nature or
   physics; by physical force; not morally.
   [1913 Webster]
         I am not now treating physically of light or colors.
                                                  --Locke.
   [1913 Webster]
   2. According to the rules of medicine. [Obs.]
      [1913 Webster]
            He that lives physically must live miserably.
                                                  --Cheyne.
      [1913 Webster] physicalness
WordNet (r) 3.0 (2006):
physically
    adv 1: in accord with physical laws; "it is physically
           impossible"