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effect

American  
[ih-fekt] / ɪˈfɛkt /

noun

  • effects
    plural
  1. An image of the word effect as defined by something that is produced by an agency or cause; result; consequence.

    something that is produced by an agency or cause; result; consequence.

    Exposure to the sun had the effect of toughening his skin.

    Synonyms:
    issue, outcome
  2. power to produce results; efficacy; force; influence.

    His protest had no effect.

  3. the state of being operative or functional; operation or execution; accomplishment or fulfillment.

    to bring a plan into effect.

  4. a mental or emotional impression produced, as by a painting or a speech.

  5. meaning or sense; purpose or intention.

    She disapproved of the proposal and wrote to that effect.

  6. the making of a desired impression.

    We had the feeling that the big, expensive car was only for effect.

  7. an illusory phenomenon.

    a three-dimensional effect.

  8. a real phenomenon (usually named for its discoverer).

    the Doppler effect.

  9. Usually effects a special effect, practical effect, or visual effect in a movie, TV show, or other video. FX


verb (used with object)

  • effects,
    present (3rd person singular)
  • effected,
    past participle,  past
  • effecting
    present participle
  1. to produce as an effect; bring about; make happen; accomplish.

    The new machines finally effected the transition to computerized accounting last spring.

    Synonyms:
    consummate, perform, fulfill, realize, achieve

idioms

  1. take effect,

    1. to go into operation; begin to function.

    2. to produce a result.

      The prescribed medicine failed to take effect.

  2. in effect,

    1. for practical purposes; virtually.

      His silence was in effect a confirmation of the rumor.

    2. essentially; basically.

    3. operating or functioning; in force.

      The plan is now in effect.

effect British  
/ ɪˈfɛkt /

noun

  1. something that is produced by a cause or agent; result

  2. power or ability to influence or produce a result; efficacy

    with no effect

  3. the condition of being operative (esp in the phrases in or into effect )

    the law comes into effect at midnight

  4. to become operative or begin to produce results

  5. basic meaning or purpose (esp in the phrase to that effect )

  6. an impression, usually one that is artificial or contrived (esp in the phrase for effect )

  7. a scientific phenomenon

    the Doppler effect

    1. in fact; actually

    2. for all practical purposes

  8. the overall impression or result

    the effect of a painting

"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

verb

  1. (tr) to cause to occur; bring about; accomplish

"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
effect More Idioms  

Usage

What's the difference between effect and affect? Effect is most commonly used as a noun meaning a result or consequence. Affect is most commonly used as a verb meaning to act on or produce a change in someone or something. Remembering the difference between the words can be especially hard because these senses of the words have just about the same pronunciation. Complicating things further is the fact that effect can also be used as a verb (meaning to make happen, as in We can only effect change by taking action) and affect can also be used as a noun (referring to a state of emotion, as in He had a sad affect). However, these senses of the words are much less commonly used. You can remember that affect is most commonly used as a verb because it begins with a, for action. You can also remember how effect and affect are most commonly used by using the acronym RAVEN:R = RememberA = Affect isV = VerbE = Effect is aN = NounHere’s an example of effect and affect used correctly in the same sentence. Example: It’s unclear what immediate effects the new law will have or how it will affect future generations. Want to learn more? Read the full breakdown of the difference between effect and affect.

Commonly Confused

See affect 1.

Synonym Usage

Effect, consequence(s), result refer to something produced by an action or a cause. An effect is that which is produced, usually more or less immediately and directly: The effect of morphine is to produce sleep. A consequence, something that follows naturally or logically, as in a train of events or sequence of time, is less intimately connected with its cause than is an effect: Punishment is the consequence of disobedience. A result may be near or remote, and often is the sum of effects or consequences as making an end or final outcome: The English language is the result of the fusion of many different elements.

Other Word Forms

Derived Forms

Inflected Forms

Nouns

Participles

Conjugated Forms

Present

Past

Future


Etymology

Origin of effect

First recorded in 1350–1400; Middle English, from Latin effectus “the carrying out (of a task, etc.),” hence, “accomplishment, outcome,” equivalent to effec- (variant stem of efficere “to make, carry out”; ef- combining form meaning “out, out from, beyond” + -ficere combining form of the verb facere “do, make”) + -tus suffix of verbal action; cf. ef-, do 1


Explanation

Effect is the result of an action, as in those “cause and effect” papers you might write in English class. Your topic could be how your late-night tuba playing (cause) has driven your roommate insane (effect). Another noun use of effect describes an appearance or impression that’s created on purpose, such as the dramatic effect of the bright red walls in your kitchen, or sound effects from your favorite movie. Effect appears less often as a verb, but when it does, it means “produce.” Usually, it’s a noun. It can even refer to your belongings, like when you get kicked out and your former roomie begs you to get all of your personal effects.

Keep Reading on Vocabulary.com

Vocabulary lists containing effect

Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

See Examples For:

“People who have been systematically impacted, been arrested and are trying to leave all of those problems behind, this can have a chilling effect on them becoming intervention workers,” Garcia-Leys said.

From Los Angeles Times ● Nov. 6, 2026

"You can imagine the effect it has on a developing brain, being in that environment for years at a time."

From BBC ● Nov. 6, 2026

The adoption of generative AI is having a profound effect on all sorts of companies.

From MarketWatch ● Nov. 6, 2026

In effect, the mineral created a natural time capsule that protected microscopic evidence of the dinosaur's biology long after its death.

From Science Daily ● Nov. 6, 2026

But for this coded note, it has an unintended side effect: since Leonardo was already writing backward, all these backward names are written forward.

From "The Mona Lisa Vanishes" by Nicholas Day

This year's El Nino, a pattern of warmer-than-normal sea surface temperatures in the equatorial Pacific that has ripple effects through the atmosphere, is exceptionally strong and could be amplifying those waves.

From Barron's ● Nov. 6, 2026

“Claude Monet: A Life in Letters”—a rich compilation of correspondences produced by five editors, led by Teresa Krasny, and translated by Louise Rogers Lalaurie—underscores the artist’s obsession with natural effects.

From The Wall Street Journal ● Nov. 6, 2026

Although these recommendations are grounded in evidence about cardiovascular risk, researchers increasingly recognize that different foods containing the same nutrients may not have identical effects on health.

From Science Daily ● Nov. 6, 2026

Mountain lions in particular are suffering from the effects of inbreeding.

From Los Angeles Times ● Nov. 6, 2026

“I must be on my way. The effects of sweetgrass are only temporary, and I must return to my pond. Don’t forget our agreement. I saved your life; now you must save mine.”

From "Healer of the Water Monster" by Brian Young

If the civil-rights revolution was primarily effected by patient application of the laws, “By Any Means” suggests some of its reforms came about via the impatient application of fists.

From The Wall Street Journal ● Sep. 3, 2026

The BBC understands that Standard Chartered aims to move some of the effected workers to other roles in the business.

From BBC ● May 19, 2026

In the end, Musk dictated the Grant’s terms, and the committee effected those wishes.”

From Los Angeles Times ● Jan. 31, 2024

Berkshire’s attorney Craig Lavoie argued that it’s crucial to block a sale next year because it will be hard to determine just how much Pilot’s earnings have been effected by the alleged bribes.

From Seattle Times ● Nov. 30, 2023

But finally, with a shrug and a worried “Ai, Chihuahua,” he climbed behind the wheel and effected another U-tum.

From "The Milagro Beanfield War" by John Nichols

Working with the Rock Liberation Front offers the only clear means for effecting change.

From Salon ● Apr. 4, 2025

That seems downright quaint now; the rip-off they are effecting is at such a bigger scale, and we hardly have time to pay attention to it.

From Slate ● Mar. 28, 2025

"You have companies that are reasonably similar, so when growth rates change it is effecting quite a few companies in a similar way," he says.

From BBC ● Mar. 26, 2025

Toranaga names Blackthorne hatamoto, an honorific indicating high status earned through his courage in effecting Toranaga’s escape.

From New York Times ● Mar. 5, 2024

The hypodermis is the immediate agent in effecting the external changes.

From Encyclopaedia Britannica, 11th Edition, Volume 13, Slice 4 "Hero" to "Hindu Chronology" by Various

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