/ djuˈreɪʃn; NAmE du-/ noun
[ U ] ( formal ) the length of time that sth lasts or continues :
The school was used as a hospital for the duration of the war.
a contract of three years' duration
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IDIOMS
- for the duration
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WORD ORIGIN
late Middle English : via Old French from medieval Latin duratio(n-) , from durare to last, from durus hard.