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classroom

[klas-room, -roo m, klahs-] /ˈklæsˌrum, -ˌrʊm, ˈklɑs-/
noun
1.
a room, as in a school or college, in which classes are held.
2.
any place where one learns or gains experience:
The sea is the sailor's classroom.
Origin
1865-1870
1865-70, Americanism; class + room
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for class-room

classroom

/ˈklɑːsˌruːm; -ˌrʊm/
noun
1.
a room in which classes are conducted, esp in a school or college
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
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Word Origin and History for class-room

classroom

n.

also class-room, 1811, from class (n.) + room (n.).

Online Etymology Dictionary, © 2010 Douglas Harper
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