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Definition of diurnal:

  1. A daybook; a journal.
  2. A diurnal bird or insect.
  3. A small volume containing the daily service for the little hours, viz., prime, tierce, sext, nones, vespers, and compline.
  4. Active by day; - applied especially to the eagles and hawks among raptorial birds, and to butterflies ( Diurna) among insects.
  5. 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.
  6. Opening during the day, and closing at night; - said of flowers or leaves.
  7. Relating to the daytime; belonging to the period of daylight, distinguished from the night; - opposed to nocturnal; as, diurnal heat; diurnal hours.

Synonyms:

daytime, cyclical, every day, once a day, regular, cyclic.

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