[1] : The Collaborative International Dictionary of English v.0.48

first \first\ f~erst, adv.
   before any other person or thing in time, space, rank, etc.;
   -- much used in composition with adjectives and participles.
   1913 webster

         adam was first formed, then eve.         --1 tim. ii.
                                                  13.
   1913 webster

   at first, at the first, at the beginning or origin.

   first or last, at one time or another; at the beginning or
      end.
      1913 webster

            and all are fools and lovers first or last.
                                                  --dryden.
      1913 webster
see also:
at first at the first first or last 

[2] : WordNet (r) 2.0

at first
     adv : at the beginning; "at first he didn't notice anything
           strange" syn: initially, ab initio, at the start
see also:
initially ab initio at the start 

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