Definition of proper noun noun from the Oxford Advanced American Dictionary

 

proper noun

 noun
noun
 
(also proper name)(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 the Oxford Advanced Learner's Dictionary entry: proper noun