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
Full of health or safety; healthy; whole; sound; safe.
Tending or serving to heal; health-promoting; healing.
Affording health or salvation.