Longman Dictionary of Contemporary English homepage

Date: 1400-1500
Origin: Probably from Old North French encassement 'frame', from casse; CASE1

casement

 noun
     
Related topics: Buildings
case‧ment also casement window [countable]
TBB a window that opens like a door with hinges at one side
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.

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