efficient

efficace, performant

Qui fonctionne bien sans gaspiller de temps, d’argent ou d’énergie.

En anglais simple : Working well without wasting time, money, or energy.

• The new system is very efficient.
• Our efficient staff finished the work early.
• This heater is more efficient than the old one.

Comment l'utiliser : efficient at doing something (She is efficient at organizing large events.)

Synonymes : well-organized, economical

Contraires : inefficient, wasteful

Expressions courantes : efficient system, efficient service, energy efficient, highly efficient

efficace, à haut rendement

Qui transforme une proportion donnée de l’énergie reçue en travail utile.

En anglais simple : Turning a stated share of the energy supplied into useful work.

• The engine is thirty percent efficient.
• This motor is more efficient at lower temperatures.
• A perfectly efficient machine would waste no energy.

Comment l'utiliser : a number + percent efficient (The motor is eighty percent efficient.)

Contraires : inefficient

Expressions courantes : thermally efficient, mechanically efficient, ninety percent efficient

efficient

Qui produit directement un effet ou fait exister quelque chose.

En anglais simple : Directly producing an effect or bringing something into existence.

• The builder is the efficient cause of the house.
• The court considered the efficient cause of the injury.
• In this theory, an efficient cause brings about a change.

Synonymes : causative

Expressions courantes : efficient cause, direct efficient cause