reason

noun

1.
a rational motive for a belief or action
hinderthought orsake wherefor ground occasion
Derived from:
reason
2.
an explanation of the cause of some phenomenon
antimber inting
3.
the capacity for rational thought or inference or discrimination
anget brains rode intellect understanding
Derived from:
reason
4.
the state of having good sense and sound judgment
rationality reasonableness
Derived from:
reason
5.
a justification for something existing or happening
cause grounds
6.
a fact that logically justifies some premise or conclusion