[door-ing, dyoor-]
throughout the duration, continuance, or existence of: He lived in Florida during the winter.
at some time or point in the course of: They departed during the night.

1350–1400; Middle English; see dure2, -ing2

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2 [door, dyoor]
verb (used without object), verb (used with object), dured, during. Archaic.

1225–75; Middle English < Old French durer < Latin dūrāre to last; see dure1

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
during (ˈdjʊərɪŋ)
1.  concurrently with (some other activity): kindly don't sleep during my lectures!
2.  within the limit of (a period of time): during the day
[C14: from duren to last, ultimately from Latin dūrāre to last]

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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Word Origin & History

late 14c., prp. of obsolete verb duren "to last, endure" (late 13c.), from O.Fr. durer, from L. durare "endure." During the day really is "while the day endures," and the usage is a transference into Eng. of a L. ablative absolute.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
In fact, both are known to decrease during stepped-up activity, including
Brain scans of a speaker and listener showed their neural activity
  synchronizing during storytelling.
During a cardiac event, blood flow to the heart ceases.
During the fighting, students on higher floors dropped books down on the
  police, and captured the scuffle on video.
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