- (countable) That which is absurd; an absurd action; a logical contradiction. [First attested in the late 15th century.]
- (uncountable) The quality of being absurd or inconsistent with obvious truth, reason, or sound judgment. [First attested in the early 16th century.]
- 1992, Rudolf M[athias] Schuster, The Hepaticae and Anthocerotae of North America: East of the Hundredth Meridian, volume V, New York, N.Y.: Columbia University Press, →ISBN, page viii:
- Neither [Jones] […] nor I (in 1966) could conceive of reducing our "science" to the ultimate absurdity of reading Finnish newspapers almost a century and a half old in order to establish "priority."
- (obsolete, rare) Dissonance. [Attested from around 1350 to 1470 until the late 17th century.]