English adjective: diurnal | |||
1. | diurnal of or belonging to or active during the day | ||
Samples | Diurnal animals are active during the day. Diurnal flowers are open during the day and closed at night. Diurnal and nocturnal offices. | ||
Domain category | biological science, biology | ||
Antonyms | nocturnal | ||
2. | diurnal having a daily cycle or occurring every day | ||
Samples | Diurnal rotation of the heavens. | ||
Similar | periodic, periodical | ||
Antonyms | aperiodic, nonperiodic | ||