effective

[ih-fek-tiv]
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adjective
  1. adequate to accomplish a purpose; producing the intended or expected result: effective teaching methods; effective steps toward peace.
  2. actually in operation or in force; functioning: The law becomes effective at midnight.
  3. producing a deep or vivid impression; striking: an effective photograph.
  4. prepared and available for service, especially military service.
noun
  1. a member of the armed forces fit for duty or active service.
  2. the effective total of a military force.

Origin of effective

1350–1400; Middle English < Latin effectīvus practical, equivalent to effect(us), past participle of efficere (see effect) + -īvus -ive
Related formsef·fec·tive·ly, adverbef·fec·tive·ness, ef·fec·tiv·i·ty, nounpre·ef·fec·tive, adjectivepre·ef·fec·tive·ly, adverbqua·si-ef·fec·tive, adjectivequa·si-ef·fec·tive·ly, adverbsub·ef·fec·tive, adjectivesub·ef·fec·tive·ly, adverbsub·ef·fec·tive·ness, nounsu·per·ef·fec·tive, adjectivesu·per·ef·fec·tive·ly, adverbsu·per·ef·fec·tive·ness, nounun·ef·fec·tive, adjectiveun·ef·fec·tive·ly, adverbun·ef·fec·tive·ness, noun
Can be confusedaffective effective (see synonym study at the current entry)

Synonyms for effective

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1. capable, competent. Effective, effectual, efficacious, efficient refer to that which is able to produce a (desired) effect. Effective is applied to that which has the power to, or which actually does, produce an effect: an effective action, remedy, speech. Effectual is used especially of that which produces the effect desired or intended, or a decisive result: An effectual bombardment silenced the enemy. Efficacious suggests the capability of achieving a certain end: an efficacious plan, medicine. Efficient (applied also to persons) implies the skillful use of energy or industry to accomplish desired results with little waste of effort: efficient methods; an efficient manager. 2. operative. 3. telling.

Antonyms for effective

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018


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British Dictionary definitions for effectiveness

effective

adjective
  1. productive of or capable of producing a result
  2. in effect; operativeeffective from midnight
  3. producing a striking impression; impressivean effective entrance
  4. (prenominal) actual rather than theoretical; realthe effective income after deductions
  5. (of a military force, etc) equipped and prepared for action
  6. physics (of an alternating quantity) having a value that is the square root of the mean of the squares of the magnitude measured at each instant over a defined period of time, usually one cycleSee also root mean square
noun
  1. a serviceman who is equipped and prepared for action
Derived Formseffectively, adverbeffectiveness, noun
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for effectiveness
n.

c.1600, from effective + -ness.

effective

adj.

late 14c., from French effectif, from Latin effectivus "productive, effective," from effect-, stem of efficere (see effect (n.)). Effectively in the sense of "actually" is attested by 1650s. Related: Effectivity.

Online Etymology Dictionary, © 2010 Douglas Harper