Definition of "uncountable" in English

adjective

1. So many as to be incapable of being counted.

   • The reasons for our failure were as uncountable as the grains of sand on a beach.

2. (mathematics) Incapable of being put into one-to-one correspondence with the natural numbers or any subset thereof.

   • Cantor’s “diagonal proof” shows that the set of real numbers is uncountable.

3. (grammar, of a noun) That cannot be used freely with numbers or the indefinite article, and therefore usually takes no plural form. Example: information.

   • Many languages do not distinguish countable nouns from uncountable nouns.
   • One meaning in law of the usually uncountable noun "information" is used in the plural and is countable.

noun

1. (grammar) A noun that is uncountable.