Definition of "bye" []

• A secondary matter; a side issue. (noun)
• Sports The position of one who draws no opponent for a round in a tournament and so advances to the next round. (noun)
• Bye By the way; incidentally. (idiom)
• Used to express farewell. (interjection)

American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

• "♫♫ Let the circle be unbroken, by & by Lord, bye& bye ♫♫"
• "In Marshallese, the language of Bikini Atoll, hello and bye alike are conveyed in the word kwe, which also means love.i In English, the expression bye was once similarly fulsome: God be with you."
• "During the first hour I felt pain, but during the rest of the evening pride kindly came to my assistance and from that moment instead of feeling myself little, I grew to a most noble and patagonian [3] nature, from which I could scarcely reduce myself for many days after; and which enabled me at the moment to turn a deaf ear to the contended merits of Demosthenes and Cicero, the Borhavians in medicine, and the &c &c &c &c — and to set and compose verses 'to my Old Oak table', which by the bye is a far better companion to me, as I will make appear, than Dr. A and his son put together."