Rationale is a synonym of reasoning.
As nouns the difference between rationale and reasoning
is that rationale
is an explanation of the basis or fundamental reasons for something while reasoning
is action of the verb to reason
As a verb reasoning is
Other Comparisons: What's the difference?
an explanation of the basis or fundamental reasons for something
a justification or rationalization for something
a liturgical vestment worn by Christian bishops of various denominations
* (explanation) , rationalization
Action of the verb to reason .
The deduction of inferences or interpretations from premises; abstract thought; ratiocination.
* (deduction of inferences) ratiocination