English Lexicon

Diurnal

/daɪˈɜːrnəl/
adjectiveCEFR B2 (Upper)Top #1500 frequency
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Comprehensive Definitions & Senses

2 senses
As adjective
  1. 1

    Active during the day; occurring or happening in the daytime.

    "Many species of birds are diurnal, foraging for food in the morning and afternoon."
  2. 2

    Relating to a 24-hour period; daily.

    "The diurnal cycle of temperature changes affects many ecosystems."

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Antonyms & Contrasting Words (1)

Linguistic Origin & Historical Etymology

The word 'diurnal' originates from the Latin 'diurnalis', which means 'daily', derived from 'diurnus', meaning 'of the day'. It has been used in English since the late Middle Ages, evolving to describe anything that occurs during the day as opposed to the night.

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