an encounter group that meets for an extended period of time, as eight hours to a week, in the belief that the resultant intensity and intimacy will lead to a more open expression of feelings.
Why Are Singing Groups Called “Glee Clubs”?These infamously chipper singing groups are called glee because the melding of voices makes everyone happy, right? Actually, joy has little to do with it.
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British Dictionary definitions for marathon group
(in psychotherapy) an encounter group that lasts for many hours or days
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