- Relating to the daytime; belonging to the period of
daylight, distinguished from the night; -- opposed to nocturnal; as,
diurnal heat; diurnal hours. - Daily; recurring every day; performed in a day; going
through its changes in a day; constituting the measure of a day; as, a
diurnal fever; a diurnal task; diurnal aberration, or diurnal parallax;
the diurnal revolution of the earth. - Opening during the day, and closing at night; -- said of
flowers or leaves. - Active by day; -- applied especially to the eagles and
hawks among raptorial birds, and to butterflies (Diurna) among insects. - A daybook; a journal. - A small volume containing the daily service for the
"little hours," viz., prime, tierce, sext, nones, vespers, and
compline. - A diurnal bird or insect.
Meaning of 'diurnal' (Princeton's WordNet)
1 . diurnal
[ a]
Meaning (1): - of or belonging to or active during the day
Example in sentence:
diurnal and nocturnal offices;
diurnal animals are active during the day;
diurnal flowers are open during the day and closed at night
2 . diurnal
[ s]
Meaning (2): - having a daily cycle or occurring every day