Pronunciation: /ˈri.zən/ Explain
  1. (verb) To reason is to form conclusions based on fact or evidence. To reason mathematically is to use the logic of mathematics to form conclusions.
  2. (noun) why something is true; a justification. See Justify.
  3. (noun) an explanation of why something is. Example:The reason the sum of the angles of a triangle is 180° is ….


  1. McAdams, David E.. All Math Words Dictionary, reason. 2nd Classroom edition 20150108-4799968. pg 152. Life is a Story Problem LLC. January 8, 2015. Buy the book

Cite this article as:

McAdams, David E. Reason. 5/1/2019. All Math Words Encyclopedia. Life is a Story Problem LLC.

Revision History

5/1/2019: Changed equations and expressions to new format. (McAdams, David E.)
12/21/2018: Reviewed and corrected IPA pronunication. (McAdams, David E.)
12/4/2018: Removed broken links, updated license, implemented new markup. (McAdams, David E.)
5/5/2011: Added second and third definitions. (McAdams, David E.)
9/4/2008: Expanded 'More Information'. (McAdams, David E.)
9/3/2007: Initial version. (McAdams, David E.)

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