1. a graphic representation of the passage of time as a line: "his book, which includes political maps, timelines, and a running glossary, is the preeminent introduction to the subject"
▪ a chronological arrangement of events in the order of their occurrence: "the CIA's timeline of his whereabouts has him arriving in Miami on May 28, 2001"
▪ a schedule for when a process or procedure will be carried out:"the committee plans to discuss a timeline for improvements to Main Street"