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a farewell or leave-taking: He said his good-nights before leaving the party.
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
good night
sentence substitute
a conventional expression of farewell, or, rarely, of greeting, used in the late afternoon, the evening, or at night, esp when departing to bed

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 night

  1. Expression of farewell used when parting at night or when going to sleep, as in He stood at the door, saying good night to each of the departing guests, or Mother came to tuck the children in and kiss them good night. [late 1300s]

  2. Exclamation of surprise or irritation, as in Good night, Joe!You can't mean what you said, or Good night, Anneit's time you learned how to throw a ball. [Late 1800s]

The American Heritage® Dictionary of Idioms by Christine Ammer.
Copyright © 1997. Published by Houghton Mifflin.
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Example sentences
Natural, organic bed linens can help you to get a good night's sleep.
Most people need only leave enough time in their busy schedules to get a good
  night's sleep.
New results challenge the view that a good night's sleep can leave behind a
  dense bloom of brain cells in the morning.
But they did much better the next morning after getting a good night's sleep.
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