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Dictionary definition for: Diurnal

1. (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"

2. (s) having a daily cycle or occurring every day; "diurnal rhythms" "diurnal rotation of the heavens" "the diurnal slumber of bats"

WordNet 2.1 Copyright Princeton University. All rights reserved.