Of, relating to, or like twilight. Or, dim; indistinct; glimmering; imperfectly luminous; obscure. The early Romans had two words for "twilight." English writers began using "crepuscular" in the 17th century, having borrowed it from the "crepusculum" used by Romans for the half-light of evening, just after the sun sets; it is a diminutive formation based on their word for "dark," which is "creper."(pr. krə-PUSS-kyə-lər)Examples of crepuscular light: George Inness (American, 1825-1894), In the Gloaming, 1893, oil on canvas, Hood Museum of Art, Dartmouth College, NH. The gloaming is synonymous with twilight.