›a plan or a line that shows the dates when the different stages of an activity or process should be completed: The plan includes a timeline mapping when each step is to be accomplished.There is no timeline in place for the state to offer tax breaks to the automaker to keep jobs in Ohio.an ambitious/tight/detailed timelinea timeline of events/actions/objectivesa timeline for sthDue to a shortage of funding, no timeline has been given for construction.a timeline for doing sthNeither side seems ready to discuss a timeline for resuming talks on a possible five-year contract.set/provide/establish a timeline (for sth)Yesterday, for the first time, the governor established a timeline for addressing the budget deficit.