# tuple

## Contents

## EnglishEdit

### EtymologyEdit

From the ending of the words *quintuple*, *sextuple*; from Latin *-plus*.

### PronunciationEdit

### NounEdit

**tuple** (*plural* **tuples**)

- (set theory) A finite sequence of terms.
*A***tuple**is not merely a totally-ordered set because the same element can appear more than once in a**tuple**: for example, qualifies as a 3-**tuple**whereas it would not qualify as a totally-ordered set (of cardinality 3), because the set would be where and so that ; i.e., it would actually be a one-element set, , not even just two-element.*If commutativity were added to a***tuple**, it would turn into a multiset or "bag". For example, words (of some alphabetic language) can be considered to be**tuples**of letters. If the ordering requirement on those letters were lifted, then the word would become a multiset of letters equivalent to those of its anagrams.

- (computing) A single row in a relational database.
- (computing) A set of comma-separated values passed to a program or operating system as a parameter to a function call.
- (computing) In some programming languages, a data type which is similar but distinct from the list data type, whose instances are characterized by having a rather fixed arity, and the elements of which instances can differ from each other by data type. (
*Note*: this definition may overlap with the previous one.)*Both Python and Haskell have a***tuple**data type as well as a list data type.*Unlike lists,***tuples**are not formed by consing.

#### SynonymsEdit

- (finite sequence of terms):
*n*-tuple (*when the sequence contains*n*terms*), ordered pair (*when the sequence contains exactly two terms*), triple*or*triplet (*when the sequence contains exactly three terms*)

#### Related termsEdit

#### TranslationsEdit

in set theory

row (record) in a database

set of values passed as a parameter