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.
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Origin of jam session
Also called jam.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
slang an unrehearsed or improvised jazz or rock performance
Word Origin for jam session
C20: probably from jam 1
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