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rationale

[rash-uh-nal] /ˌræʃ əˈnæl/
noun
1.
the fundamental reason or reasons serving to account for something.
2.
a statement of reasons.
3.
a reasoned exposition of principles.
Origin of rationale
1650-1660
1650-60; < Latin: neuter of ratiōnālis rational
Synonyms
1. logic, basis, grounds.
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Based on the Random House Dictionary, © Random House, Inc. 2015.
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British Dictionary definitions for rationale

rationale

/ˌræʃəˈnɑːl/
noun
1.
a reasoned exposition, esp one defining the fundamental reasons for a course of action, belief, etc
Word Origin
C17: from New Latin, from Latin ratiōnālis
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin and History for rationale
n.

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
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