Definition of decade noun from the Oxford Advanced Learner's Dictionary

    

decade

 noun
noun
BrE BrE//ˈdekeɪd//
 
; NAmE NAmE//ˈdekeɪd//
 
; BrE BrE//dɪˈkeɪd//
 
; NAmE NAmE//dɪˈkeɪd//
 
 
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a period of ten years, especially a continuous period, such as 1910–1919 or 2000–2009 Word Origin late Middle English (denoting each of ten parts of a literary work): via Old French and late Latin from Greek deka ‘ten’. The current sense dates from the early 17th cent.Extra examples Hines has spent the last decade in Austin, Texas. Now entering her fourth decade, the singer is living alone in New York. The past decade has seen a huge rise in the number of broadband users. This decade began badly for us. This decade has passed uneventfully. a career spanning four decades almost a full decade of unparalleled economic growth the early decades of the 19th century The effects of climate change have been increasingly apparent over the last decade. The nineties were a decade of rapid advances.
See the Oxford Advanced American Dictionary entry: decade