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English definition of “timeline”

timeline

noun [C]     /ˈtaɪm.laɪn/
a line that shows the time and the order in which events have happenedRelating to timeOrder and sequenceSimultaneous and consecutive a plan that shows how long something will take or when things will happenRelating to timeOrder and sequenceSimultaneous and consecutive
(Definition of timeline noun from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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