early 14c., from Old French constellacion "constellation, conjuncture (of planets)," from Late Latin constellationem (nominative constellatio) "set with stars," from constellatus, from Latin com- "with" (see com-) + past participle of stellare "to shine," from stella "star" (see star). Originally in astrology, of position of planets ("stars") in regard to one another on a given day, usually one's birth day, as a determination of one's character. "I folwed ay myn inclinacioun/By vertu of my constillacioun" (Chaucer, "Wife's Prologue," c.1386). Modern astronomical sense is from 1550s.
An easily recognized group of stars that appear to be located close together in the sky and that form a picture if lines connecting them are imagined. Constellations are usually named after an animal, a character from mythology, or a common object. (See Big Dipper, Ursa Major, and Ursa Minor.)
a cluster of stars, or stars which appear to be near each other in the heavens, and which astronomers have reduced to certain figures (as the "Great Bear," the "Bull," etc.) for the sake of classification and of memory. In Isa. 13:10, where this word only occurs, it is the rendering of the Hebrew _kesil_, i.e., "fool." This was the Hebrew name of the constellation Orion (Job 9:9; 38:31), a constellation which represented Nimrod, the symbol of folly and impiety. The word some interpret by "the giant" in this place, "some heaven-daring rebel who was chained to the sky for his impiety."