good day

a conventional expression used at meeting or parting during the daytime.

1175–1225; Middle English Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
good day
sentence substitute
a conventional expression of greeting or farewell used during the day

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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American Heritage
Idioms & Phrases

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® Dictionary of Idioms by Christine Ammer.
Copyright © 1997. Published by Houghton Mifflin.
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Example sentences
On a good day, an experienced fossil excavator might uncover only a few inches
  of skeleton.
Look at the article as a whole, imagine the chaos reference isn't there, and
  have a good day.
Have a good day and please try to be more courteous in your exchanges.
No matter how bad your day is, if you come home to a new species of fly, it is
  a good day.
Idioms & Phrases
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