du·ra·tion

[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

du·ra·tion·al, adjective
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2013.
Cite This Source Link To duration
00:10
Duration is always a great word to know.
So is quincunx. Does it mean:
a chattering or flighty, light-headed person.
an arrangement of five objects, as trees, in a square or rectangle, one at each corner and one in the middle.
Collins
World English Dictionary
duration (djʊˈreɪʃən) [Click for IPA pronunciation guide]
 
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
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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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.
Also, when you talk about duration or length in relativity, you always have to
  state with respect to which observer.
All in all, hundreds of performers appear on three stages over the event's
  duration.
The vast amount of vacant lands, the value of which daily augments, forms an
  additional resource of great extent and duration.
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