Synonyms for diurnal
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- 1. diurnal (vs. nocturnal)
- usage: of or belonging to or active during the day; "diurnal animals are active during the day"; "diurnal flowers are open during the day and closed at night"; "diurnal and nocturnal offices"
- 2. diurnal, periodic (vs. aperiodic), periodical
- usage: having a daily cycle or occurring every day; "diurnal rotation of the heavens"