Definition of rationality in English:

rationality

noun

mass noun
  • 1The quality of being based on or in accordance with reason or logic.

    ‘like any phobia, rationality plays only a small role’
    1. 1.1 The quality of being able to think sensibly or logically.
      ‘Scott wanted to play the character with a bit more dignity and rationality’
    2. 1.2 The quality of being endowed with the capacity to reason.
      ‘we call rationality the distinction of man, when compared with other animals’
  • 2Mathematics
    The property of a number, quantity, or expression of being expressible, or containing quantities which are expressible, as a ratio of whole numbers.

Pronunciation

rationality

/raʃ(ə)ˈnalɪti/