- (linguistics) An uncountable noun.
- 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.
- (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.
- (grammar, of a noun) Describes a meaning of a noun that cannot be used freely with numbers or the indefinite article, and which therefore takes no plural form. Example: information.
- Many languages do not distinguish countable nouns from uncountable nouns.
- One meaning in law of the supposedly uncountable noun "information" is used in the plural and is countable.
un- + countable (count + -able)