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Meaning of count noun

count' noun"

Pronunciation: [key]
— Gram. Gram.
  1. a noun, as apple, table, or birthday, that typically refers to a countable thing and that in English can be used in both the singular and the plural and can be preceded by the indefinite article a or an and by numerals. Cf. mass noun.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.