What does zeitgeber mean?
A zeitgeber is a signal that tells an organism what time it is by synchronizing its internal biological clock. The most familiar example is the regular alternation of daylight and darkness, which helps regulate circadian rhythms such as sleep, hormone release, and activity. Other zeitgebers can include meal times, social cues, and recurring environmental events. The word is especially common in chronobiology and related scientific fields, where researchers investigate how external timing signals affect physiological processes. It can also be used more broadly for anything that sets or influences a schedule. Derived from the German words Zeit, meaning “time,” and Geber, meaning “giver,” the term captures its central idea succinctly: a zeitgeber gives an organism the information needed to keep its internal time in step with external time.
nounA cue, especially an external stimulus such as light, that synchronizes or entrains an organism’s biological clock and related physiological rhythms.
- A cue, especially an external stimulus such as light, that synchronizes or entrains an organism’s biological clock and related physiological rhythms.
"The daily cycle of light and darkness acts as a zeitgeber, keeping the organism’s internal clock aligned with the environment."
"Morning light is a powerful zeitgeber that resets the circadian rhythms of many mammals."
"In the experiment, researchers altered the feeding zeitgeber to determine whether it affected the animals’ activity cycles."
The plural is formed by adding -s; singular and plural both end in -er.
"Researchers compared the effects of different zeitgebers on the animals’ sleep cycles."
A zeitgeber does more than mark time: it tells the body what time it is, repeatedly teaching its internal clock when to wake, sleep, and perform other rhythms.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Etymology of zeitgeber
Zeitgeber is a German compound formed from Zeit, meaning “time,” and Geber, meaning “giver” or “one who gives”; Geber is related to geben, the German verb “to give.” The compound was adopted into English as a technical term for an external cue that entrains biological rhythms. Its development reflects the longstanding scientific practice of examining how organisms use environmental signals to regulate their internal clocks.
How zeitgeber is actually used
Primarily used in chronobiology, biology, medicine, and related technical writing. Outside specialist contexts, it may sound like specialist jargon, and it can also be used figuratively for anything that establishes or influences a schedule.
Easily confused with zeitgeber
A zeitgeber is a biological timing cue, whereas the zeitgeist is the defining spirit or outlook of a particular period.