a small enclosure, usually portable, in which a young child can play safely alone without constant supervision.
playground ( defs 2, 3 ).

1930–35; play + pen2 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
playpen (ˈpleɪˌpɛn)
a small enclosure, usually portable, in which a young child can be left to play in safety

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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Computing Dictionary

playpen definition

(IBM) A room where programmers work.
Compare salt mines.
[Jargon File]

The Free On-line Dictionary of Computing, © Denis Howe 2010
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Example sentences
The regional boards overseeing the river levees, once a patronage playpen, have
  been restructured and professionalised.
The tribunal seemed little more than a playpen for lawyers.
The size of a coffee mug, the cylindrical robot slides across a round
  meter-sized playpen on an apparently chaotic path.
It would be a touch silly to suggest putting such people in the equivalent of a
  large playpen.
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