duration

[doo-rey-shuhn, dyoo-]
noun
1.
the length of time something continues or exists (often used with the ).
2.
continuance in time.
3.
(in the philosophy of Bergson) a temporal continuum, intuitively known, within which the élan vital operates.

Origin:
1350–1400; Middle English < Medieval Latin dūrātiōn- (stem of dūrātiō), equivalent to Latin dūrāt(us) (past participle of dūrāre to last; see dure2) + -iōn- -ion

durational, adjective
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World English Dictionary
duration (djʊˈreɪʃən)
 
n
the length of time that something lasts or continues
 
[C14: from Medieval Latin dūrātiō, from Latin dūrāre to last]
 
du'rational
 
adj

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Etymonline
Word Origin & History

duration
late 14c., from O.Fr. duration, from M.L. durationem (nom. duratio), from L. durare "harden" (see endure). Phrase for the duration (1916) originally refers to British enlistment in World War I.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
Some authors have even supposed that, as the individual has a definite length of life, so have species a definite duration.
All in all, hundreds of performers appear on three stages over the event's duration.
Also, when you talk about duration or length in relativity, you always have to state with respect to which observer.
The fund seeks to maintain an effective duration of three and one-half to seven
  years under normal market conditions.
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