Diurnal Definition

dī-ûrnəl
adjective
Occurring each day; daily.
Webster's New World
Of, done, or happening in the daytime.
Webster's New World
Active in the daytime.
Webster's New World
Opening in the daytime and closing at night.
Webster's New World

Having a daily cycle that is completed every 24 hours, usually referring to tasks, processes, tides, or sunrise to sunset.

Wiktionary
Antonyms:
noun

A flower that opens only in the day.

Wiktionary
A service book containing prayers for the daytime canonical hours and for compline.
Webster's New World
A diary or journal.
American Heritage
A daily newspaper.
Webster's New World

Other Word Forms of Diurnal

Noun

Singular:
diurnal
Plural:
diurnals

Origin of Diurnal

  • Middle English from Late Latin diurnālis from Latin diurnus from diēs day dyeu- in Indo-European roots

    From American Heritage Dictionary of the English Language, 5th Edition

  • From Latin diurnālis, from diēs (“day”). Cognate with journal.

    From Wiktionary

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