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good day

interjection
1.
a conventional expression used at meeting or parting during the daytime.
Origin of good day
1175-1225
Middle English word dating back to 1175-1225
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2018.
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British Dictionary definitions for good day

good day

sentence substitute
1.
a conventional expression of greeting or farewell used during the day
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for good day

salutation, late 14c., short for have a good day (c.1200). Good morning is c.1400, gode morwene. Good night, also goodnight, is late 14c.; as an exclamation of surprise, from 1893.

Online Etymology Dictionary, © 2010 Douglas Harper
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Idioms and Phrases with good day

good day

Also, good afternoon or evening or morning . Formal ways of saying “Hello” or “Goodbye.” For example, He began rather oddly by addressing the audience with Good day ,” or “ Good afternoon, ladies ,” said the sales clerk as we walked out . All these greetings represent an abbreviation of the now obsolete God give you a good day (afternoon, etc.) , which dates from about 1200. Also see good night
The American Heritage® Idioms Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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