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Webster 1913 Edition

Noun.

[L.

obscurativ

: cf. F.

obscuration

. See

Verb.

]

The act or operation of obscuring; the state of being obscured;

as, the

obscuration

of the moon in an eclipse

Sir J. Herschel.

Noun.

[L. obscuratio.]

The act of darkening.

The state of being darkened or obscured; as the obscuration of the moon in an eclipse.

obscuration ‎(plural obscurations)

the state of being obscured
- 1843, Thomas Carlyle, Past and Present, book 3, ch. X, Plugson of Undershot
  Money is miraculous. What miraculous facilities has it yielded, will it yield us; but also what never-imagined confusions, obscurations has it brought in; down almost to total extinction of the moral-sense in large masses of mankind!
a unit of measurement used in particular for smoke detectors which respond to absorption of light by smoke, in percent absorption per unit length, e.g. % obs/ft, % obs/m.