Definition of nocturnal
- a nocturnal journey
- nocturnal activities
- a nocturnal predator
- nocturnal insects, such as mosquitoes
he bought a new telescope so he could pursue his favorite nocturnal hobby of astronomy
These example sentences are selected automatically from various online news sources to reflect current usage of the word 'nocturnal.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.
First Known Use: 15th centurySee Words from the same year
: active mainly during the night
: happening at night
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