effective

efficace

Qui fonctionne bien et donne le résultat souhaité.

En anglais simple : Something that works well and gives the result you want.

• This is an effective treatment for headaches.
• Their new strategy was surprisingly effective.
• Which method is most effective for teaching beginners?

Comment l'utiliser : effective against something (This spray is effective against mosquitoes.); effective in doing something (The lessons were effective in improving her reading.)

Synonymes : successful, useful, efficient

Contraires : ineffective

Expressions courantes : effective treatment, effective method, effective against something, effective protection

en vigueur

Qui s’applique officiellement à partir d’un moment donné.

En anglais simple : Officially applying or operating from a particular time.

• The new rules are effective immediately.
• The agreement became effective last month.
• What is the effective date of the change?

Comment l'utiliser : effective from a date (The contract is effective from the first of June.); effective on a date (The new policy becomes effective on Monday.)

Synonymes : in force, valid

Expressions courantes : effective date, become effective, effective from monday

percutant, efficace

Qui influence fortement les sentiments, les pensées ou les actions des gens.

En anglais simple : Having a strong effect on how people feel, think, or act.

• Her speech was brief but effective.
• The silence made the final scene especially effective.
• He delivered an effective argument that changed several minds.

Synonymes : powerful, persuasive, forceful

Contraires : ineffective

Expressions courantes : effective speech, effective ending, effective argument

effectif, de fait

Qui existe réellement ou s’exerce en pratique, même sans reconnaissance officielle.

En anglais simple : Actually present or held in practice, even without official recognition.

• The rebels had effective control of the town.
• She held effective power despite having no official title.
• The agreement gave workers effective control over hiring.

Synonymes : actual, de facto

Expressions courantes : effective control, effective command, effective power

à compter de, à partir de

Indique le moment où quelque chose commence officiellement à s’appliquer.

En anglais simple : Starting officially at the time mentioned.

• Effective Monday, parking will be free.
• The company raised its prices effective yesterday.
• Effective next year, all students will receive free lunches.

Comment l'utiliser : effective + time (Effective tomorrow, the office will open at eight.)

Synonymes : as of, starting from

Expressions courantes : effective immediately, effective tomorrow, effective next month