"Goodbye" came from "God bye" which came from "God be with you."
More definitions of a word
The word 'set' has more definitions than any other word in the English language.
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The first Oxford English Dictionary was published in April 1928, 50 years after it was started. It consisted of 400,000 words and phrases in 10 volumes. The latest edition fills 22,000 pages, includes 33,000 Shakespeare quotations, and is bound in 20 volumes. All of which is available on a single CD or flash drive.
Aoccdrnig to a rscheearch at Cmabrigde Uinervtisy, it deosn't mttaer in waht oredr the ltteers in a wrod are, the olny iprmoetnt tihng is taht the frist and lsat ltteer be at the rghit pclae. The rset can be a toatl mses and you can sitll raed it wouthit porbelm. Tihs is bcuseae the huamn mnid deos not raed ervey lteter by istlef, but the wrod as a wlohe.