brilliance of success, reputation, etc.: the éclat of a great achievement.
2.
showy or elaborate display: a performance of great éclat.
3.
acclamation; acclaim.
Origin: 1665–75; < French: splinter, fragment, burst, flash, brilliance, Old Frenchesclat, noun derivative of esclater to burst, break violently, probably < Old Low Franconian*slaitan to split, break (compare Old High Germansleizan to tear), a causative of Germanic*slitan; see slit
1670s, "showy brilliance," from Fr. éclat "splinter, fragment" (12c.), also "flash of brilliance," from eclater "burst out, splinter," from O.Fr. esclater, of uncertain origin, perhaps from a W.Gmc. word related to slit or to O.H.G. sleizen "tear to pieces; to split,
cleave." Extended sense of "conspicuous success" is first recorded in English in 1741.