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nocturnal

/nɑkˈtɝ.nəl/ adjective C1
  1. Of a person, creature, group, or species, primarily active during the night. · nocturnal birds
  2. Of an occurrence, taking place at night, nightly. · a suspicious nocturnal outing
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In this way my second link was formed, which told me that the nocturnal visitors were two in number, one remarkable for his height (as I calculated from the length of his stride), and the other fashionably dressed, to judge from the small and elegant impression left by his boots.
A Study in Scarlet, p. 81 · B2
What was this nocturnal expedition, and why should I go armed?
The Adventures of Sherlock Holmes, p. 22 · B2
“What becomes, then, of these nocturnal whistles, and what of the very peculiar words of the dying woman?”
The Adventures of Sherlock Holmes, p. 49 · B2
That night he went out as usual for his nocturnal walk, in the course of which he was in the habit of smoking a cigar.
The Hound of the Baskervilles, p. 18 · C1

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Words, meanings, pronunciations and translations from Wiktionary (CC BY-SA 4.0); how common each word is from wordfreq. Made into this dictionary by FluentPlex.