Efficient, serviceable, or operative, available for useful work.
approximate; Not describing the fundamental dynamic changes in some system as they happen.
Having no negative coefficients.
Producing a decided or decisive effect.
Having the power to produce a required effect or effects.
Actually in effect.
a soldier fit for duty
Capable of or characterized by a high or excellent level of performance or efficiency.
Characterized by a level of performance or efficiency that is adequate for or exceeds the expectations of end users.
Of or relating to performance.