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jam session

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noun
  1. a meeting of a group of musicians, especially jazz musicians, to play for their own enjoyment.
  2. an impromptu jazz performance or special performance by jazz musicians who do not regularly play together.

Origin of jam session

1930–35; perhaps jam1, or by shortening of jamboree
Also called jam.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
British Dictionary definitions for jam session

jam session

noun
  1. slang an unrehearsed or improvised jazz or rock performance

Word Origin

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