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.

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.

plural of diurnal

daily / By daylight. / Every daytime.

(rare) The quality of being diurnal.

plural of diurnality

The condition or habit of being active during the day.

The condition of being diurnal / The condition of being a diurnalist

(astrology) the path followed by a planet, point, or degree from its rising point to its setting point.

plural of diurnal arc