an instance of sleeping over, as at another person's house.
a person who sleeps over.

1970–75; noun use of verb phrase sleep over Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
sleepover (ˈsliːpˌəʊvə)
informal chiefly (US) an instance of spending the night at someone else's home

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Example sentences
Some will stay out for a few nights before returning to the stockades, as
  though they'd been away at a sleepover.
It is hardly shocking that teenagers at a sleepover party would engage in
  raunchy behavior.
It can be used short-term for an important sleepover, or prescribed for
  long-term use for months.
She skipped her normal bedtime bath because of the sleepover.
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