Longman Dictionary of Contemporary English homepage

Date: 1800-1900
Origin: Because the maps were originally made for the department responsible for ordnance: ordnance 'military materials' (14-20 centuries), from Old French ordenance

Ordnance Survey map

noun
     
Related topics: Geography
Ordnance Survey map [countable] British English
SG a map which shows all the roads, paths, hills etc of an area in detail

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