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1an obscuring of the light from one celestial body by the passage of another between it and the observer or between it and its source of illumination:an eclipse of the sun a loss of significance, power, or prominence in relation to another person or thing:the election result marked the eclipse of the traditional right and center 2 Ornithology a phase during which the distinctive markings of a bird (especially a male duck) are obscured by molting of the breeding plumage: [as modifier]:eclipse plumage
verb [with object]
(of a celestial body) obscure the light from or to (another celestial body):as the last piece of the sun was eclipsed by the moon literary obscure or block out (light):a sea of blue sky violently eclipsed by showers deprive (someone or something) of significance, power, or prominence:the state of the economy has eclipsed the environment as the main issue
1losing or having lost significance, power, or prominence:his political power was in eclipse 2 Ornithology (especially of a male duck) in its eclipse plumage.