a flat plate in a printing press for pressing the paper against the inked type or plate to produce an impression.
a rotating cylinder used for the same purpose.
the roller of a typewriter.
(on a planing machine or the like) the bed to which the work is fastened.
(on a testing machine) a plate for applying compression to a sample.

1400–50; earlier platyne, late Middle English plateyne chalice cover < Middle French platine. See plate1, -ine1 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
platen (ˈplætən)
1.  a flat plate in a printing press that presses the paper against the type
2.  the roller on a typewriter, against which the keys strike
3.  the worktable of a machine tool, esp one that is slotted to enable T-bolts to be used
[C15: from Old French platine, from plat flat; see plate]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Example sentences
One half is connected to a movable platen and the other is connected to a stationary platen.
Platen presses are commonly referred to as cutting or creasing presses.
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