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A
Of, relating to, or resembling twilight — used in literature to describe something dim, dusky, or associated with the fading of light.
— OED
B
In zoology, describing animals that are primarily active at dawn and dusk, as opposed to diurnal (day-active) or nocturnal (night-active) creatures.
— Zoology reference
C
From the Latin crepusculum, meaning twilight, which is itself thought to derive from creper, meaning dark or uncertain.
— Latin etymology
D
Many predators, including wolves, deer, rabbits, and domestic cats, are classified as crepuscular, exploiting the low-light period when both day and night prey are active.
— Ecology texts
E
J.R.R. Tolkien used crepuscular as a private term in his linguistic notebooks to describe the Elvish quality of existing between worlds — neither fully in one realm nor another.
— Tolkien linguistic papers