diurnal: meaning, definition, pronunciation and examples
C1/C2Formal, technical, literary, academic
Quick answer
What does “diurnal” mean?
Of or during the day.
Audio
Pronunciation
Definition
Meaning and Definition
Of or during the day; occurring or active in the daytime (as opposed to nocturnal).
1. Daily; recurring every day. 2. In botany/zoology: describing flowers that open only during the day or animals active in daylight. 3. In astronomy: relating to the apparent daily motion of celestial objects.
Dialectal Variation
British vs American Usage
Differences
No significant difference in core meaning or usage. Slightly higher frequency in British academic writing in ecological contexts.
Connotations
Both variants carry formal/scientific connotations. No notable difference.
Frequency
Low-frequency word in both dialects, used primarily in technical registers.
Grammar
How to Use “diurnal” in a Sentence
[Adj.] diurnal + noun (rhythm, cycle)[Pred. Adj.] The animal is diurnal.[Adj.] subject to diurnal variationVocabulary
Collocations
Examples
Examples of “diurnal” in a Sentence
adjective
British English
- The diurnal rhythm of the tides is influenced by the moon.
- We studied several diurnal primates in the Kenyan savannah.
- The data showed a clear diurnal variation in air pressure.
American English
- Most squirrels are diurnal, foraging for nuts during daylight hours.
- The diurnal cycle of heating and cooling drives local winds.
- The astronomer measured the diurnal motion of the stars.
Usage
Meaning in Context
Business
Rare. Might appear in technical reports (e.g., 'diurnal fluctuations in energy demand').
Academic
Common in biology, ecology, astronomy, meteorology (e.g., 'studying diurnal foraging patterns').
Everyday
Very rare. Used for precise contrast with 'nocturnal' (e.g., 'Is that bird diurnal?').
Technical
Primary domain. Describes cycles, behaviours, or phenomena tied to the day/night cycle.
Watch out
Common Mistakes When Using “diurnal”
- Using 'diurnal' to mean 'ordinary' or 'commonplace'.
- Pronouncing it as /ˈdaɪ.ɜː.nəl/ (stress on first syllable).
- Using it in casual contexts where 'daily' would suffice.
FAQ
Frequently Asked Questions
Yes, but it's formal. 'Quotidian' or 'daily' are more common. 'Diurnal' often implies a cycle tied to daylight.
'Nocturnal' is the direct antonym, meaning 'of the night' or 'active at night'.
No, it's a mid-to-low frequency word used mostly in scientific, academic, or formal literary contexts.
Link 'di-' to 'day' (think 'dial' for sun dial) and 'noct-' to 'night' (think 'nocturne', a piece of music for the night).
Of or during the day.
Diurnal is usually formal, technical, literary, academic in register.
Diurnal: in British English it is pronounced /daɪˈɜː.nəl/, and in American English it is pronounced /daɪˈɝː.nəl/. Tap the audio buttons above to hear it.
Phrases
Idioms & Phrases
- “The diurnal round (formal/literary: the routine of daily life)”
Learning
Memory Aids
Mnemonic
DIUrnal = During the Day. Think 'DIE' (as in 'day' in Latin 'dies') + 'URNAL' sounds like 'journal' (a daily record).
Conceptual Metaphor
TIME IS CYCLE (The diurnal cycle structures our lives). LIGHT IS ACTIVITY (Diurnal creatures are metaphors for those active in 'the light of reason' or public life).
Practice
Quiz
In which context is 'diurnal' LEAST likely to be used?