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classroom

[klas-room, -roo m, klahs-]
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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.
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Origin of classroom

An Americanism dating back to 1865–70; class + room
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

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British Dictionary definitions for classroom

classroom

noun
  1. a room in which classes are conducted, esp in a school or college
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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

Word Origin and History for classroom

n.

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

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Online Etymology Dictionary, © 2010 Douglas Harper