adv ·4 syllables ·Rare ·Advanced level

Definitions

Adverb

1. 1
   By daylight; in the daytime. not-comparable
2. 2
   Habitually during the day; every daytime. not-comparable

   "Sparrows are most active diurnally."

3. 3
   On a 24-hour period, a frequency of once per 24 hours; daily. not-comparable

   "These flowers open and close diurnally."

Synonyms

All synonyms

circadianlydaily

Antonyms

All antonyms

at nightnocturnally

Example

More examples

"Sparrows are most active diurnally."

Etymology

From diurnal + -ly.

Data sourced from Wiktionary, WordNet, CMU, and other open linguistic databases. Updated March 2026.