## EnglishEdit

### EtymologyEdit

The word is used since the beginning of the 20th century in Mathematics. It has been built from the Latin verb *denumerare* meaning to count out.

### AdjectiveEdit

**denumerable** (*not comparable*)

- (mathematics) Capable of being assigned numbers from the natural numbers. Especially applied to sets where finite sets and sets that have a one-to-one mapping to the natural numbers are called denumerable.
*The empty set is***denumerable**because it is finite; the rational numbers are, surprisingly,**denumerable**because every possible fraction can be assigned a number.