From The Collaborative International Dictionary of English v.0.48 :
Provisionally \Pro*vi"sion*al*ly\, adv. By way of provision for the time being; temporarily. --Locke. [1913 Webster]From WordNet (r) 3.0 (2006) :
provisionally adv 1: temporarily and conditionally; "they have agreed provisionally"; "was appointed provisionally"