diurnal meaning
EN
[daɪˈɜːnəɫ] [daɪˈɝ.nəl] [-ɜː(r)nəl] 
US WDiurnal
- Diurnal ("daily") may refer to:
- Diurnal cycle, any pattern that recurs daily
- Diurnality, the behavior of animals and plants that are active in the daytime
- Diurnal motion, the apparent motion of stars around the Earth
- Diurnal phase shift, a phase shift of electromagnetic signals
- Diurnal temperature variation, a cycle of daily temperature change
- In astrology:
- Diurnal chart, a chart for a given date, based on the natal chart
- Diurnal planet, a planet in a sect for which the Sun is above the horizon
- Diurnal sign, a sign in the zodiac
- NounPLdiurnals
- Adjective
- Happening or occurring during daylight, or primarily active during that time.
- Most birds are diurnal.
- (botany) Said of a flower open, or releasing its perfume during daylight hours, but not at night.
- Having a daily cycle that is completed every 24 hours, usually referring to tasks, processes, tides, or sunrise to sunset.
- (uncommon) Done once every day; daily, quotidian.
- (archaic) Published daily.
- Happening or occurring during daylight, or primarily active during that time.
- More Examples
- Used in the Middle of Sentence
- For nor'west diurnal periods of similar extraterrestrial irradiance (EI), the nor'wester's potential influence tends to increase with the reduction of Qr* by cloudiness.
- Used in the Middle of Sentence
Definition of diurnal in English Dictionary
- Part-of-Speech Hierarchy
- Adjectives
- Uncomparable adjectives
- Uncomparable adjectives
- Nouns
- Countable nouns
- Countable nouns
- Adjectives
- en diurnals
- en diurnally
- en diurnalist
- en diurnalists
- en diurnalness
Source: Wiktionary
Grammatically, this word "diurnal" is an adjective, more specifically, an uncomparable adjective. It's also a noun, more specifically, a countable noun.