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work-hour

or work·hour, working hour

[wurk-ouuh r, -ou-er]
noun
  1. any of the hours of a day during which work is done, as in an office, usually between 9 a.m. and 5 p.m.
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Origin of work-hour

First recorded in 1840–50
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018