Definitions

from The American Heritage® Dictionary of the English Language, 5th Edition.

  • interjection Used to express an acknowledgment of parting at night or of going to bed.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • phrase A farewell said in the evening or before going to sleep.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • noun a conventional expression of farewell

Etymologies

from Wiktionary, Creative Commons Attribution/Share-Alike License

Probably a shortening of "May you have a good night."

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Examples

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