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goodbye

or good-bye

[goo d-bahy]
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interjection
  1. farewell (a conventional expression used at parting).
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noun, plural good·byes.
  1. a farewell.
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Origin of goodbye

First recorded in 1565–75; contraction of God be with ye
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

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British Dictionary definitions for goodbye

goodbye

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
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noun
  1. a leave-taking; partingthey prolonged their goodbyes for a few more minutes
  2. a farewellthey said goodbyes to each other
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Word Origin

C16: contraction of God be with ye
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012