Betsy's car gets very efficient gas mileage.
An example of efficient is a car that gets 60 miles to a gallon of gas.
Origin of efficientMiddle English and Old French from Classical Latin efficiens, present participle of efficere: see effect
- Acting or producing effectively with a minimum of waste, expense, or unnecessary effort: an efficient builder; an efficient factory.
- Acting directly to produce an effect: the efficient cause of the revolution.
- Causing less waste or requiring less effort than comparable devices or methods. Used in combination: energy-efficient wind turbines; cost-efficient health care.
Origin of efficientMiddle English from Old French from Latin efficiēns efficient- present participle of efficere to effect ; see effect .
(comparative more efficient, superlative most efficient)
- Making good, thorough, or careful use of resources; not consuming extra. Especially, making good use of time or energy.
- An efficient process would automate all the routine work.
- Our cleaners are almost too efficient: they throw away anything left out on a desk.
- Using a particular proportion of available energy.
- The motor is only 20% efficient at that temperature.
- Causing effects; producing results.
1398, "making," from Old French, from Latin efficientem (nominative efficiens), preposition of efficere "work out, accomplish" (see effect). Meaning "productive, skilled" is from 1787. Efficiency apartment is first recorded 1930, American English.