early 15c., "normality," from natural (adj.) + -ness. From 1650s as "state of being natural," also "conformity to nature; absence of artificiality, exaggeration, or affectation."
the spontaneous naturalness of his manner
he accepted the naturalness of death
engineers strove to increase the naturalness of recorded music
naturalistic
naturality
naturalization
naturalize
naturally
naturalness
nature
naturist
naturopathy
*nau-
naufragous