Diurnal
/daɪˈɜrnəl/
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Definition
(adj) Happening or occurring during daylight, or primarily active during that time.
Sentence Examples
Cheetahs are diurnal because their hunting technique relies on sight.
Degus make lovely pets: they are diurnal and hence are awake when you are.
CEFR Practice Quiz
Cheetahs are ____ because their hunting technique relies on sight.