Home › Words › R › rebaselinerebaselinerebaseline means to provide (a project) with a new baseline.EtymologyFrom re- + baseline.verbTo provide (a project) with a new baseline.e.g.“Rebaselining should only be used as a last resort in controlling the schedule...” — 2004, Wei Lee, Pmp Project Management Professional: A Graphical Study Guide:Definitions & examples from Wiktionary (CC BY-SA 3.0).