The extent to which a resource is used for the intended purpose.
(ant)
(quote-journal)
The ratio of useful work to energy expended. Often given the symbol ''(m)''.
(ux)
The extent to which time is well used for the intended task.
(quote-web)
The quality of producing an effect or effects.
{{RQ:Hooker Laws
A one-room apartment.
(synonyms)