proper noun

an ad hoc grammatical feature on nouns, whose typical reference is to a unique instance, ¶2-7-4, ¶11-3-4; a p. n. may form a plural and then refers to a corresponding set comprising the membership of each unique set or instances of the members of a collection (the figure called synecdoche), ¶11-4-1; semantically the feature p. is an abbreviation for the feature chain: reference, determinate, definite, specific, constant, instance