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1. [s] having a daily cycle or occurring every day; "diurnal rhythms"; "diurnal rotation of the heavens"; "the diurnal slumber of bats"

2. [a] 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"

similar words

1. [a] cyclic

2. [a] cyclical

opposite words

1. [a] nocturnal

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