Definition of proper noun noun from the Oxford Advanced Learner's Dictionary

 

proper noun

 noun
noun
BrE BrE//ˌprɒpə ˈnaʊn//
 
; NAmE NAmE//ˌprɑːpər ˈnaʊn//
 
(also proper name)(grammar) Grammar
 
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a word that is the name of a person, a place, an institution, etc. and is written with a capital letter, for example Tom, Mrs Jones, Rome, Texas, the Rhine, the White House compare abstract noun, common noun See related entries: Grammar
See the Oxford Advanced American Dictionary entry: proper noun