jam-session

jam session

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.
Also called jam.


Origin:
1930–35; perhaps jam1, or by shortening of jamboree

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Collins
World English Dictionary
jam session
 
n
slang an unrehearsed or improvised jazz or rock performance
 
[C20: probably from jam1]

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