Diurnality is a form of plant and animal behavior characterized by activity during daytime, with a period of sleeping or other inactivity at night. The common adjective used for daytime activity is " diurnal ".

The meaning of DIURNAL is active chiefly in the daytime. How to use diurnal in a sentence.

DIURNAL definition: of or relating to a day or each day; daily. See examples of diurnal used in a sentence.

DIURNAL meaning: 1. being active or happening during the day rather than at night: 2. happening over a period of a…. Learn more.

Jan 20, 2026 · Adjective diurnal (not comparable) Happening or occurring during daylight, or primarily active during that time.

4 meanings: 1. happening during the day or daily 2. (of flowers) open during the day and closed at night 3. (of animals) active.... Click for more definitions.

Define diurnal. diurnal synonyms, diurnal pronunciation, diurnal translation, English dictionary definition of diurnal. adj. 1. Relating to or occurring in a 24-hour period; daily.

Definition of diurnal adjective in Oxford Advanced Learner's Dictionary. Meaning, pronunciation, picture, example sentences, grammar, usage notes, synonyms and more.

Diurnal refers to activities or behaviors that occur during the day or a cycle that lasts 24 hours, repeating with the pattern of a day and night. It's commonly used to describe animals that are active during the …

1. Relating to or occurring in a 24-hour period; daily. 2. Occurring or active during the daytime rather than at night: diurnal animals. 3. Botany Opening during daylight hours and closing at night.