The Collaborative International Dictionary of English v.0.48:
Initially \In*i"tial*ly\, adv. In an initial or incipient manner or degree; at the beginning. --Barrow. [1913 Webster]WordNet (r) 3.0 (2006):
initially adv 1: at the beginning; "at first he didn't notice anything strange" [syn: initially, ab initio]