Definition

Active, occurring, or done during the night rather than the day; of or relating to the night.

Example Usage

Owls are nocturnal hunters, sleeping during the day and hunting at night.

Origin

From Latin nocturnus, from nox (night).

Fun Fact

Many animals have evolved nocturnal behavior to avoid predators or compete less with diurnal species.

Source: Definition backfill (hailey)

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