good night

noun
an expression of farewell used in parting at nighttime or when going to sleep.

Origin:
1325–75; Middle English

Dictionary.com Unabridged

good-night

[good-nahyt]
noun
a farewell or leave-taking: He said his good-nights before leaving the party.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2013.
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00:10
Good night is always a great word to know.
So is callithumpian. Does it mean:
a fool or simpleton; ninny.
a children's mummer's parade, as on the Fourth of July, with prizes for the best costumes.
Collins
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
More airlines offer a good night's sleep, flat-bed seats.
When tested on new facts, people remember them better after a good night's
  sleep than after a short break.
To study the brain waves of a good night's sleep, scientists invited volunteers
  to snooze in the lab.
We know that a good night's sleep helps to solidify our memories of the
  previous day's experiences.
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