farewell (a conventional expression used at parting).
noun, plural good-byes.
a farewell.
Also, goodbye.

1565–75; contraction of God be with ye Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
goodbye (ˌɡʊdˈbaɪ)
sentence substitute
1.  farewell: a conventional expression used at leave-taking or parting with people and at the loss or rejection of things or ideas
2.  a leave-taking; parting: they prolonged their goodbyes for a few more minutes
3.  a farewell: they said goodbyes to each other
[C16: contraction of God be with ye]

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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Word Origin & History

1591, from godbwye (1573), itself a contraction of God be with ye, infl. by good day, good evening, etc.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
Then, after two kisses goodbye at the schoolhouse door, she heads back home to
Say goodbye to fumbling with your map, having to take off your pack to get it
  out and have it exposed to the elements.
Yah, ridiculous when the alternative is to simply kiss the species goodbye.
We get things done in two or three hours and then it's goodbye.
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