Webster's Revised Unabridged Dictionary · 1913

Rationality

Rationality (rash"un*al"i*ty; 277) , noun

[French rationalité, or Latin rationalitas.]

The quality or state of being rational; agreement with reason; possession of reason; due exercise of reason; reasonableness.
When God has made rationality the common portion of mankind, how came it to be thy inclosure? — Gov. of Tongue
Well-directed intentions, whose rationalities will never bear a rigid examination. — Sir T. Browne