The Collaborative International Dictionary of English v.0.48:
Sequential \Se*quen"tial\, a. Succeeding or following in order. -- Se*quen"tial*ly, adv. [1913 Webster]WordNet (r) 3.0 (2006):
sequential adj 1: in regular succession without gaps; "serial concerts" [syn: consecutive, sequent, sequential, serial, successive]