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Definition of effectiveness : The quality of being effective.

Synonyms:

intensity level, suasiveness, durability, long suit, affect, conclusiveness, influence, enduringness, military posture, military strength, strength, lastingness, authorisation, effectualness, potential, force, say-so, dominance, convincingness, persuasiveness, efficacity, specialty, cogency, potentiality, effectivity, potence, intensity, potency, edge, productiveness, strong suit, military capability, authorization, metier, point, effectuality, forcefulness, posture, speciality, efficacy, forte, efficaciousness, impact, authority, strong point, persuasion, effect

efficiency, timeliness, advantageousness, expedience, fitness, convenience, well-timedness, desirability, suitability, opportunity, propriety, aptness

Usage examples:

• For effectiveness, it shared to some extent the characteristic features of legislation for making water run up hill. - "The Critical Period of American History", John Fiske.
• This apparel, he admitted, had undergone some wear, as the property of a previous owner, being, in fact, what is known as second- handed; but, because of its effectiveness of design and the fortunate circumstance of its being a perfect fit, he had not hesitated to purchase it. - "Fibble, D. D.", Irvin Shrewsbury Cobb.
• Quantity, by which is meant the length of syllables, formed the basis of versification in Latin and Greek poetry; but in English poetry it is used to give variety, music, or some other element of effectiveness to the verse. - "Elementary Guide to Literary Criticism", F. V. N. Painter.