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
Sociable or friendly.
A dockyard worker.
A fellow sailor; often used affectedly, especially when portraying a pirate.