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diurnal - 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 - having a daily cycle or occurring every day; diurnal rotation of the heavens.
diurnal (comparative more diurnal, superlative most diurnal) 1  Happening or occurring during daylight, or primarily active during that time. Most birds are diurnal. ( 2 botany) Said of a flower open, or releasing its perfume during daylight hours, but not at night.