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.
The state of being obscured.
subfraction
subfraction
noun
The result of fractionating a fraction into smaller components
subharmonic
subharmonic
adj
(physics) Having a frequency that is a fraction of a fundamental frequency
noun
Such a frequency
subnarcotic
subnarcotic
adj
(medicine) Moderately narcotic.
subordinacy
subordinacy
Noun
The property or condition of being subordinate.
subtraction
subtraction
noun
(arithmetic, countable) A calculation involving subtracting.
(arithmetic, uncountable) The process of subtracting a number from another.
