Having the power to produce a required effect or effects.
approximate; Not describing the fundamental dynamic changes in some system as they happen.
Efficient, serviceable, or operative, available for useful work.
Having no negative coefficients.
Producing a decided or decisive effect.
Actually in effect.
a soldier fit for duty
High powered, energetic, forceful or dynamic.
Having a high octane number, good anti-knock characteristics; used in high performance vehicles.
Highly intoxicating or caffeinated.