American Heritage Dictionary
(2)
Century Dictionary
GNU Webster's 1913
WordNet
(1)
Elsewhere on the web
PROSECUTORS do not have a strong case for the murder charge on the 14-year-old accused of shooting schoolboy Josef Cruickshank dead at a sleepover, a magistrate said today.— Daily Telegraph | Top Stories
Write about a sleepover, a slumber party or the time you stayed somewhere overnight.— Blogpourri
Wait a minute - how the heck do you define the word sleepover anyway?— Entertainment Weekly's PopWatch
If there was a sleepover, all the children longed to be invited.— Kansas City Star: Front Page

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