rationality

From French rationalité, from Late Latin rationalitas (“rationality, reasonableness”), from Latin rationalis (“reasonable”)

rationality (usually uncountable, plural rationalities)

1. The quality or state of being rational; due exercise of reason; reasonableness.

   His sudden loss of rationality was brought on by excess drink.

2. Objectivity, considerateness.

   Such a discussion deserves rationality, not emotion a gut reaction.

• rationalness

• instrumental rationality

• rationality in Webster’s Revised Unabridged Dictionary, G. & C. Merriam, 1913.
• rationality in The Century Dictionary, New York, N.Y.: The Century Co., 1911.