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jam session

a meeting of a group of musicians, especially jazz musicians, to play for their own enjoyment.
an impromptu jazz performance or special performance by jazz musicians who do not regularly play together.
Also called jam.
Origin of jam session
1930-35; perhaps jam1, or by shortening of jamboree Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2018.
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British Dictionary definitions for jam session

jam session

(slang) an unrehearsed or improvised jazz or rock performance
Word Origin
C20: probably from jam1
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
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Slang definitions & phrases for jam session

jam session

noun phrase

Agathering of musicians, esp jazz musicians, playing freely and for one another, but sometimes in a public performance; jam: Here's Dodo on the piano and Tiny on the bass. Looks like we'll have a fine jam session (1930s+ Jazz musicians)

The Dictionary of American Slang, Fourth Edition by Barbara Ann Kipfer, PhD. and Robert L. Chapman, Ph.D.
Copyright (C) 2007 by HarperCollins Publishers.
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