noun ·Rare ·Advanced level

Definitions

Noun

1. 1
   The normal duration of natural daylight experienced by an organism; daylength

Synonyms

All synonyms

daydaylengthdaylightdaytime

Antonyms

All antonyms

nighttimescotoperiod

Etymology

From photo- + period.

Related phrases

circadian rhythm

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