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What do a.m. and p.m. stand for?

working hour

noun
1.

work-hour

[wurk-ouuh r, -ou-er] /ˈwɜrkˌaʊər, -ˌaʊ ər/
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.
Origin of work-hour
1840-1850
1840-50
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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