The partial or complete obscuring, relative to a designated observer, of one celestial body by another. The period of time during which such an obscuration occurs. A temporary or permanent dimming or cutting off of light. A fall into obscurity or disuse; a decline: "A composer . . . often goes into eclipse after his death and never regains popularity\u201d ( Time). A disgraceful or humiliating end; a downfall: Revelations of wrongdoing helped bring about the eclipse of the governor's career. To cause an eclipse of. To obscure; darken. To obscure or diminish in importance, fame, or reputation. To surpass; outshine: an outstanding performance that eclipsed the previous record.