noun, plural ra·tion·al·i·ties.

  1. the state or quality of being rational.
  2. the possession of reason.
  3. agreeableness to reason; reasonableness.
  4. the exercise of reason.
  5. a reasonable view, practice, etc.

noun plural -ties

  1. the state or quality of being rational or logical
  2. the possession or utilization of reason or logic
  3. a reasonable or logical opinion
  4. economics the assumption that an individual will compare all possible combinations of goods and their prices when making purchases

1620s, “quality of having reason;” 1650s, “fact of being agreeable to reason,” from French rationalité, from Late Latin rationalitas “reasonableness, rationality” (also source of Spanish racionalidad, Italian razionalita), from Latin rationalis (see rational).

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