Real Dictionary

active
any impairment of normal physiological function affecting all or part of an organism, esp a specific pathological change caused by infection, stress, etc, producing characteristic symptoms; illness or sickness in general [...]
matter remaining after something has been removed [...]
the active voice [...]
the condition of a person, thing, etc, with regard to main attributes [...]
the piece of land where something was, is, or is intended to be located [...]
the shape or configuration of something as distinct from its colour, texture, etc [...]
adjective: If someone is active in an organization, cause, or campaign, they do things for it rather than just giving it their support.
adjective: If you have an active mind or imagination, you are always thinking of new things.
adjective: Someone who is active moves around a lot or does a lot of things.