Diurnal

1. Happening or occurring during daylight, or primarily active during that time.
2. (botany) Said of a flower open, or releasing its perfume during daylight hours, but not at night.
3. Having a daily cycle that is completed every 24 hours, usually referring to tasks, processes, tides, or sunrise to sunset; circadian.
4. (uncommon) Done once every day; daily, quotidian.
5. (archaic) Published daily..

Synonyms

• (having a daily cycle): circadian (biology)

Antonyms

• (happening or active during the day):nocturnal, nightly
• (active or open during the day): nocturnal