• Rationality
  Rationality
  In philosophy, rationality is the exercise of reason. It is the manner in which people derive conclusions when considering things deliberately. It also refers to the conformity of one's beliefs with one's reasons for belief, or with one's actions with one's reasons for action...
  
  , a concept of reason
• Rational number
  Rational number
  In mathematics, a rational number is any number that can be expressed as the quotient or fraction a/b of two integers, with the denominator b not equal to zero. Since b may be equal to 1, every integer is a rational number...
  
  , a number that can be expressed as a ratio of two integers
• Rational function
  Rational function
  In mathematics, a rational function is any function which can be written as the ratio of two polynomial functions. Neither the coefficients of the polynomials nor the values taken by the function are necessarily rational.-Definitions:...
  
  , a mathematical function which can be written as the ratio of two polynomial functions
• Rational Software
  Rational Software
  Rational Machines was founded by Paul Levy and Mike Devlin in 1981 to provide tools to expand the use of modern software engineering practices, particularly explicit modular architecture and iterative development...
  
  , formerly Rational Software Corporation, a software company now owned by IBM
• a central paradigm of Rational Emotive Behavior Therapy
  Rational emotive behavior therapy
  Rational emotive behavior therapy , previously called rational therapy and rational emotive therapy, is a comprehensive, active-directive, philosophically and empirically based psychotherapy which focuses on resolving emotional and behavioral problems and disturbances and enabling people to lead...
  
  
• The Rational temperament
  Rational temperament
  The Rational temperament is one of the four temperaments defined by David Keirsey. Correlating with the NT Myers-Briggs types, the Rational temperament comprises the following role variants : Architect , Fieldmarshal , Inventor , and Mastermind .-Description:Rationals are abstract in speech...
  
   in the Keirsey Temperament Sorter
• Rational choice theory
  Rational choice theory
  Rational choice theory, also known as choice theory or rational action theory, is a framework for understanding and often formally modeling social and economic behavior. It is the main theoretical paradigm in the currently-dominant school of microeconomics...
  
  , a theoretical paradigm in microeconomics
• Rational AG
  Rational AG
  Rational AG is a German manufacturer of industrial food steamers and ovens for catering purposes. The firm is headquartered in Landsberg am Lech, Germany. Since 4 March 2009 it is a constituent of the MDAX index.- History :...
  
  , a German manufacturer of food processors

See also

• Rationalism (disambiguation)
  Rationalism (disambiguation)
  Rationalism may refer to:* Rationalism, a philosophical position, theory, or view that reason is the source of knowledge* Rationalism , same philosophical theory applied in theology, contrary to revelation...
  
  
• Rationale
  Rationale
  A rationale is a liturgical vestment worn by clergy, in particular by Bishops, in the Roman Catholic Church which uses full vestments. It is humeral ornament, a counterpart to the Pallium, and is worn over the chasuble...
  
  , a liturgical vestment worn by clergy
• Rationality
  Rationality
  In philosophy, rationality is the exercise of reason. It is the manner in which people derive conclusions when considering things deliberately. It also refers to the conformity of one's beliefs with one's reasons for belief, or with one's actions with one's reasons for action...