Definitions from Wiktionary (effective)

▸ adjective:  Having the power to produce a required effect or effects.
▸ adjective:  Producing a decided or decisive effect.
▸ adjective:  Efficient, serviceable, or operative, available for useful work.
▸ adjective:  Actually in effect.
▸ adjective:  (geometry, of a cycle or divisor) Having no negative coefficients.
▸ adjective:  (algebra, of a group action) Such that no group element acts trivially.
▸ adjective:  (physics, for any effective theory) approximate; Not describing the fundamental dynamic changes in some system as they happen.
▸ noun:  (military) a soldier fit for duty
▸ Also see effective

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