Twilight; the dim light of early morning or late evening; the period of partial darkness at these times.
Latin word meaning twilight, possibly related to 'creperus' (dusky) or 'crebare' (to creak). This is the original Latin form from which English 'crepuscule' and 'crepuscular' derive.
Medieval monks divided prayer times by crepusculum—they prayed at crepusculum matutinum (dawn) and crepusculum vespertinum (dusk)—and this shows how twilight was considered significant enough to structure entire religious daily routines.
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