Longman Dictionary of Contemporary English homepage

Date: 1300-1400
Language: Old French
Origin: Latin durare 'to continue in existence'

duration

 noun
     
du‧ra‧tion [uncountable]
the length of time that something continues:
The course is of three years' duration.
for the duration (of something)
The package includes cycle hire for the duration of your holiday.
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.

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