Hypertext Webster Gateway: "obscuration"
From Webster's Revised Unabridged Dictionary (1913) (web1913)
Obscuration \Ob`scu*ra"tion\, n. [L. obscurativ: cf.F.
obscuration. See {Obscure}, v. t. ]
The act or operation of obscuring; the state of being
obscured; as, the obscuration of the moon in an eclipse.
--Sir J. Herschel.
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