effective

adjective

• 1successful in producing a desired or intended result:effective solutions to environmental problems
• (of a law, rule, or policy) operative:the regulation will be effective from January

• 2 [attributive] existing in fact, though not formally acknowledged as such:she has been under effective house arrest since September
• assessed according to actual rather than face value:an effective price of £176 million

noun

• a soldier fit and available for service: when the battles broke out, he had a total of 920 effectives