diurnal
/dai'ə:nl/
Definition
- Adjective:
- Having a daily cycle or occurring every day: Refers to events, patterns, or rotations that complete one full cycle within a 24-hour period.
- Of or belonging to or active during the day: Describes organisms or activities that are primarily operative in the daylight hours, as opposed to the night.
Examples of Usage
- Adjective:
- The diurnal rotation of the Earth is responsible for the cycle of day and night.
- Most birds, like robins, are diurnal creatures.
- The diurnal rhythm of the plant involves opening its flowers at dawn.
Advanced Usage
- Scientific Context: In astronomy, "diurnal" describes the apparent daily motion of celestial bodies across the sky.
- The diurnal motion of the stars is caused by Earth's rotation.
- Biological Context: In biology and ecology, it categorizes an animal's primary period of activity.
- The study compared the hunting strategies of diurnal and nocturnal predators.
Variants and Related Words
- Diurnally (adverb): In a manner that occurs every day or during the daytime.
- The temperature fluctuates diurnally.
- Diurnality (noun): The condition of being active during the day.
- The diurnality of the species is an adaptation to its environment.
Synonyms
- Daily: Occurring, done, or produced every day.
- Daytime: Of, relating to, or occurring during the day.
Antonyms
- Nocturnal: Active at night.
- Crepuscular: Active during twilight (dawn and dusk).
Adjective
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having a daily cycle or occurring every day
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diurnal rotation of the heavens
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of or belonging to or active during the day
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diurnal animals are active during the day
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diurnal flowers are open during the day and closed at night
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diurnal and nocturnal offices
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