nocturnalityn.
/ˌnɒktəːˈnalᵻti/, U.S. /ˌnɑktərˈnælədi/ Zoology.
Nocturnal behaviour; the condition of being nocturnal.
ΚΠ
1934 Amer. Jrnl. Ophthalmol. 17 1045 The presence of the spectacle is thus correlated, in most cases, not simply with crawling but with crawling and nocturnality.
1951 M. Smith Brit. Amphibians & Reptiles (1973) vi. 248 Much of the adder's prey is captured in burrows, and this may explain the slit pupil; an adaptation to hunting underground rather than nocturnality.
2001 Environmental Biol. Fishes 60 411 Adjustments to nocturnality have included enhanced sensory capabilities that detect prey in low light.
This is a new entry (OED Third Edition, December 2003; most recently modified version published online March 2022).
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n.1934