Diurnal vs. Diel — What's the Difference?

Relating to or occurring in a 24-hour period; daily.

(biology) Having a 24-hour period regardless of day or night.

Occurring or active during the daytime rather than at night

(Botany) Opening during daylight hours and closing at night.

A book containing all the offices for the daily canonical hours of prayer except matins.

A diary or journal.

A daily newspaper.

Happening or occurring during daylight, or primarily active during that time.

(botany) Said of a flower open, or releasing its perfume during daylight hours, but not at night.

Having a daily cycle that is completed every 24 hours, usually referring to tasks, processes, tides, or sunrise to sunset; circadian.

(uncommon) Done once every day; daily, quotidian.

(archaic) Published daily.

A flower that opens only in the day.

(Catholicism) A book containing canonical offices performed during the day, hence not matins.

(archaic) A diary or journal.

(archaic) A daily news publication.

Relating to the daytime; belonging to the period of daylight, distinguished from the night; - opposed to nocturnal; as, diurnal heat; diurnal hours.

Daily; recurring every day; performed in a day; going through its changes in a day; constituting the measure of a day; as, a diurnal fever; a diurnal task; diurnal aberration, or diurnal parallax; the diurnal revolution of the earth.

Opening during the day, and closing at night; - said of flowers or leaves.

Active by day; - applied especially to the eagles and hawks among raptorial birds, and to butterflies (Diurna) among insects.

A daybook; a journal.

A small volume containing the daily service for the "little hours," viz., prime, tierce, sext, nones, vespers, and compline.

A diurnal bird or insect.

Belonging to or active during the day;

Having a daily cycle or occurring every day;