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Definition of effective : 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.
2. One who is capable of active service.
3. Specie or coin, as distinguished from paper currency; - a term used in many parts of Europe.
4. That which produces a given effect; a cause.
5. The serviceable soldiers in a country; an army or any military body, collectively; as, France's effective.

Synonyms:

compelling, producing the expected result, legal, striking, capable, forcible, operative, in force, competent, telling, forceful, rough-and-ready, active, adequate, dynamic, yielding, trenchant, hard-hitting, be, vigorous, operational, sound, dynamical, actual, existent, efficacious, thrive, cogent, valid, in effect, impelling, producing the desired result, good, sufficient

formative, causal, motivational, generative, germinal, pivotal, causative, executive, responsible

autocratic, authoritarian, imperious, consequential, impressive, important, powerful, influential, authoritative, commanding, masterful, strong, arrogant, dictatorial, potent

productive, fruitful, resultant

advantageous, timely, convenient, fit, desirable, efficient, useful, opportune, expedient, suitable, accommodating, apt, commodious

effectual, usable, applied, functional, fitting, reusable, beneficial, appropriate, practical, all-purpose, multipurpose, handy, instrumental, applicable, versatile, utilitarian, practicable, utilizable, helpful, available, at hand, serviceable, employable

Usage examples:

• He taught me an effective delivery of my sentences. - "The Adventures of Harry Richmond, Complete", George Meredith Last Updated: March 7, 2009.
• This way may be effective. - "An Interpretation of Friends Worship", N. Jean Toomer.
• We may not be able to do enough to be effective. - "Abraham Lincoln", John Drinkwater.