rationale

[rash-uh-nal]
noun
1.
the fundamental reason or reasons serving to account for something.
2.
a statement of reasons.
3.
a reasoned exposition of principles.

Origin:
1650–60; < Latin: neuter of ratiōnālis rational


1. logic, basis, grounds.
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World English Dictionary
rationale (ˌræʃəˈnɑːl)
 
n
a reasoned exposition, esp one defining the fundamental reasons for a course of action, belief, etc
 
[C17: from New Latin, from Latin ratiōnālis]

Collins English Dictionary - Complete & Unabridged 10th Edition
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Etymonline
Word Origin & History

rationale
1657, from L.L. rationale, noun use of neuter of L. rationalis "of reason" (see rational).
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences for rationales
The halflife of policy rationales how new technology affects old policy issues.
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