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 callithumpian. Does it mean:
an arrangement of five objects, as trees, in a square or rectangle, one at each corner and one in the middle.
a children's mummer's parade, as on the Fourth of July, with prizes for the best costumes.
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
So one rationale behind steel and aluminium mergers is to gain more leverage
  over suppliers.
Since then, no better rationale for lobotomy has been advanced.
Underlying the rationale for eye tracking is the notion that attention is
  central to seeing.
The student develops a plan of study that includes the courses and a rationale
  for the courses he/she has selected.
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