circadian C2 Topic:Time US /sɚˈkeɪ.di.ən/ UK /səˈkeɪ.dɪ.ən/ See IPA manual Freq #66635 Meanings 1 adj of or relating to biological processes occurring at 24-hour intervals Circadian rhythms. Thesaurus Synonyms dailydiurnalnychthemeral Common collocations circadian rhythm Adjective + noun Etymology From the Latin circā (“about”) and diēs (“a day”) with the English suffix -an. Compare circannual. circā Latin View etymology graph -> Topics Time Word Formation & Derivatives External links Cambridge Dictionary Wiktionary Google Images # circadian **Type:** Word **Level:** C2 **Part of speech:** adj **IPA (US):** /sɚˈkeɪ.di.ən/ **IPA (UK):** /səˈkeɪ.dɪ.ən/ **Frequency rank:** 66635 ## Meanings 1. of or relating to biological processes occurring at 24-hour intervals ## Examples - Circadian rhythms. ## Synonyms - daily - diurnal - nychthemeral ## Roots and Affixes - Root: circā ## Etymology From the Latin circā (“about”) and diēs (“a day”) with the English suffix -an. Compare circannual. ## Topics - Time - Word Formation & Derivatives markdown