/ ˈdjʊərɪŋ; NAmE ˈdʊr-/ preposition
1.
all through a period of time :
during the 1990s
There are extra flights to Colorado during the winter.
Please remain seated during the performance.
2.
at some point in a period of time :
He was taken to the hospital during the night.
I only saw her once during my stay in Rome.
HELP NOTE : During is used to say when something happens; for answers the question 'how long?':
I stayed in London for a week.
I stayed in London during a week.
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WORD ORIGIN
late Middle English : present participle of the obsolete verb dure last, endure, extend, via Old French from Latin durare to last, from durus hard.