Rationality, n.; pl. -ties.
Etymology: [F. rationalité, or L. 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.
Shades of meaning
Fernald lists rationality only as an antonym, under insanity.
He lists it without comment; the entries above explain its neighbors.
Synonyms
none given