- (a.) A small volume containing the daily service for the "little hours," viz., prime, tierce, sext, nones, vespers, and compline.
- (a.) A daybook; a journal.
- (a.) Active by day; -- applied especially to the eagles and hawks among raptorial birds, and to butterflies (Diurna) among insects.
- (a.) A diurnal bird or insect.
- (a.) Relating to the daytime; belonging to the period of daylight, distinguished from the night; -- opposed to nocturnal; as, diurnal heat; diurnal hours.
- (a.) Opening during the day, and closing at night; -- said of flowers or leaves.
- (a.) 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.
Webster's Revised Unabridged Dictionary
| APA | Webster's. (2011). diurnal. Retrieved September 29, 2026, from http://smartdefine.org/diurnal/definitions/1999538 |
| Chicago | Webster's. 2011. "diurnal" http://smartdefine.org/diurnal/definitions/1999538 (accessed September 29, 2026). |
| Harvard | Webster's 2011, diurnal, Smart Define, viewed 29 September, 2026, <http://smartdefine.org/diurnal/definitions/1999538>. |
| MLA | Webster's. "diurnal" 27 May 2011. Web. 29 September 2026. <http://smartdefine.org/diurnal/definitions/1999538> |