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slumber party

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noun
  1. a social gathering typically of teenagers held at the home of one of them for the purpose of sleeping there overnight.
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Origin of slumber party

First recorded in 1920–25
Also called pajama party.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

British Dictionary definitions for slumber party

slumber party

noun
  1. US and Canadian a party attended by girls who dress in night clothes and pass the night eating and talking
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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