- The definition of crepuscular is dim, or active during the twilight hours.
An example of something crepuscular is a room with little light.
- of or like twilight; dim
- active at twilight or just before sunrise: crepuscular insects
Origin: see crepuscule
Used by arrangement with John Wiley & Sons, Inc.
- Of or like twilight; dim: “the period's crepuscular charm and a waning of the intense francophilia that used to shape the art market” (Wall Street Journal).
- Zoology Becoming active at twilight or before sunrise, as do bats and certain insects and birds.