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.
Compare mass noun.
Origin of count noun
First recorded in 1950–55
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012