a conventional expression used at meeting or parting during the daytime.
Origin
1175-1225;Middle English
Examples from the web for good day
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.
Have a good day and don't let people who do not understand ruffle any feathers.
Chief among these is the realization that every day is a good day to apply for an adjunct job.
The tear was so large that you could easily see a good third of the back of her underwear on a good day.
It's easy, since this place-the library-is crowded, packing in the equivalent of a fourth of the student population on a good day.
On a good day, she might write a grammatical sentence, provided that there were no confusing adjectives or adverbs.
He does a good day's work who rids himself of a fool.
British Dictionary definitions for good day
good day
sentence substitute
1.
a conventional expression of greeting or farewell used during the day
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.
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