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Obscuration

noun

Noun

1
The state of being obscured. countable, uncountable
"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!"
2
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. countable, uncountable

From Latin obscūrātiō. By surface analysis, obscure + -ation.

Unscramble this word: obscuration