Definition of zeitgeber in English:

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zeitgeber

Pronunciation: /ˈzʌɪtɡeɪbə/

noun

Physiology
A rhythmically occurring natural phenomenon which acts as a cue in the regulation of the body’s circadian rhythms.
Example sentences
  • And while light is a common zeitgeber, other external stimuli can play this role as well.
  • Consider one zeitgeber that virtually all businesses share: the quarterly business calendar.
  • Scientists call external time cues zeitgebers.

Origin

Mid 20th century: from German Zeitgeber, from Zeit 'time' + Geber 'giver'.

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