Pronunciation: /yuˈnik/ Explain

A mathematical object is unique if there exists exactly one. If a mathematical object is unique, one says, 'There exists one and only one.'


  • The empty set is unique. There is one and only one empty set.
  • In Euclidean geometry two points define a unique line. There is exactly one line defined by the two points.

Cite this article as:

McAdams, David E. Unique. 8/7/2018. All Math Words Encyclopedia. Life is a Story Problem LLC. http://www.allmathwords.org/en/u/unique.html.

Revision History

8/7/2018: Changed vocabulary links to WORDLINK format. (McAdams, David E.)
9/15/2008: Added 'More Information'. (McAdams, David E.)
7/14/2008: Initial version. (McAdams, David E.)

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