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

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 ".

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.

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

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.

of or belonging to the daytime. daily. of or belonging to the daytime (opposed to nocturnal). Botany showing a periodic alteration of condition with day and night, as certain flowers that open by day and …

The adjective diurnal can be used to describe anything that takes place in the daytime, but it is most often used in the field of biology to describe animals that are active during the day and then sleep at …