the fundamental reason or reasons serving to account for something.
a statement of reasons.
a reasoned exposition of principles.

Nearby words

  1. rational horizon,
  2. rational number,
  3. rational operation,
  4. rational therapy,
  5. rational-emotive therapy,
  6. rationalise,
  7. rationalism,
  8. rationalist,
  9. rationality,
  10. rationalization

Origin of rationale

1650–60; < Latin: neuter of ratiōnālis rational

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for rationale

British Dictionary definitions for rationale



a reasoned exposition, esp one defining the fundamental reasons for a course of action, belief, etc

Word Origin for rationale

C17: from New Latin, from Latin ratiōnālis

Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for rationale



1650s, "exposition of principles," from Late Latin rationale, noun use of neuter of Latin rationalis "of reason" (see rational). Hence, "fundamental reason" (1680s).

Online Etymology Dictionary, © 2010 Douglas Harper