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



    BrE BrE//nɒkˈtɜːnl//
    ; NAmE NAmE//nɑːkˈtɜːrnl//
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  1. 1(of animals) active at night These animals are strictly nocturnal. These insects are largely nocturnal. opposite diurnal
  2. 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 the Oxford Advanced American Dictionary entry: nocturnal

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