Literally þof the dayþ, but here meaning having a period or a þtidal dayþ, i e about 24 8 hours
Pertaining to actions or events that occur during a twenty-four hour cycle or recurs every twenty-four hours Meteorological elements that are measured diurnally include clouds, precipitation, pressure, relative humidity, temperature, and wind
Daily; related to actions which are completed in the course of a calendar day, and which typically recur every calendar day (e g , diurnal temperature rises during the day, and diurnal falls at night)
daily, or the daily cycle A diurnal plot is usually a representative midnight-to-midnight graph of values measured at a smaller time interval (e g , hourly or 5-minute values)
belonging to or active during the day; "diurnal animals are active during the day"; "diurnal flowers are open during the day and closed at night"
having a daily cycle or occurring every day; "diurnal rhythms"; "diurnal rotation of the heavens"; "the diurnal slumber of bats" belonging to or active during the day; "diurnal animals are active during the day"; "diurnal flowers are open during the day and closed at night
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
Repeated or recurring daily. Having a daily cycle of completed actions in 24 hours and recurring every 24 hours. Thus, most reference is made to diurnal tasks, cycles, tides, or sunrise to sunset
Tidal system having one high tide per tidal day (24 hours, 50 minutes) Such systems are less common than semidiurnal systems Commonly, diurnal systems are microtidal, but macrotidal, diurnal systems can occur (see Archer, 1995)
Relating to the daytime; occurring during daylight hours (Morris 1992) A mammal that is active mostly during daylight hours is said to be diurnal Voles tend to be diurnal rather than nocturnal which refers to the night
Having a period or cycle of approximately one tidal day Thus, the tide is said to be diurnal when only one high water and one low water occur during a tidal day, and the tidal current is said to be diurnal when there is a single flood and a single ebb period of a reversing current in the tidal day A rotary current is diurnal if it changes its direction through all points of the compass once each tidal day A diurnal constituent is one which has a single period in the constituent day The symbol for such a constituent is the subscript 1 See stationary wave theory and type of tide