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Definition of nocturnal adjective from the Oxford Advanced Learner's Dictionary

nocturnal

adjective
 
/nɒkˈtɜːnl/
 
/nɑːkˈtɜːrnl/
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  1. (of animals) active at night
    • owls and other nocturnal creatures
    • These animals are strictly nocturnal.
    • These insects are largely nocturnal.
    opposite diurnal
  2. (formal) happening during the night
    • a nocturnal visit
  3. Word Originlate 15th cent.: from late Latin nocturnalis, from Latin nocturnus ‘of the night’, from nox, noct- ‘night’.
See nocturnal in the Oxford Advanced American DictionarySee nocturnal in the Oxford Learner's Dictionary of Academic English

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