ra·tion·ale

[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) [Click for IPA pronunciation guide]
 
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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00:10
Rationale is always a great word to know.
So is zedonk. Does it mean:
a gadget; dingus; thingumbob.
the offspring of a zebra and a donkey.
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
Which is odd, since that's the entire rationale for the magazine.
Potential threats from rogue nations provide the rationale for the president's
  cost-is-no-object missile-defense plan.
Now they appear to have a deep, physiological rationale.
The stated rationale for the embargo has shifted over the years.
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