Webster dictionary was developed by Noah Webster in the beginning of 19th century. On this website, you can find definition for effective from the 1913 edition of Webster's Revised Unabridged Dictionary. Define effective using one of the most comprehensive free online dictionaries on the web.

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effective
Part of Speech: Noun
Results: 6
1. Having the power to produce an effect or effects; producing a decided or decisive effect; efficient; serviceable; operative; as, an effective force, remedy, speech; the effective men in a regiment.
Part of Speech: noun
1. That which produces a given effect; a cause.
3. The serviceable soldiers in a country; an army or any military body, collectively; as, France's effective.
4. Specie or coin, as distinguished from paper currency; - a term used in many parts of Europe.
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