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TOEFL IELTS BNC: 2196 COCA: 2998

efficient

Word family 
ef·fi·cient /ɪˈfɪʃənt/ ●●● S3 W3 adjectiveadj
EFFICIENTif someone or something is efficient, they work well without wasting time, money, or energy 有效率的；高效能的 OPP inefficient
a very efficient secretary
效率高的秘書
an efficient use of land
土地的有效使用
Lighting is now more energy efficient.
如今的照明設備更加節能。
—efficiently adverbadv
n COLLOCATIONS
adverbs
extremely/highly efficient
The factory is modern and highly efficient.
efficient + NOUN
an efficient way
Email is an efficient way of contacting a large number of people.
an efficient method
The railways used to provide a cheap efficient method of travel.
an efficient means
The tram is a very efficient means of transport.
an efficient system
We need a more efficient system for collecting money.
an efficient service
We aim to provide our clients with an efficient and friendly service.
the efficient use of something
We must work towards the more efficient use of all natural resources.
the efficient operation of something
The law must protect investors without interfering with the efficient operation of the market.
NOUN + efficient
energy/fuel efficient (=not wasting any fuel or energy)
an energy efficient heating system
cost efficient (=costing or spending as little as possible)
The larger a firm becomes the more cost efficient it can become.
Examples from the Corpus
efficient• Modern houses are much more energy efficient• Organisationally, the working of both payroll and personnel records has been very useful in providing an efficient administrative service.• If you are already using Ventura then these changes will all make your work more efficient and easy.• This is the most efficient and economical washing machine on the market.• Service at the restaurant is efficient and friendly.• It is so efficient and saves vast amounts of time and money.• Or the child may at first become even less efficient and then show some improvement.• Government rules now require car companies to design and produce cars with increasingly efficient engines.• They point out that bottom-up statistical methods are efficient from a computational point of view, but exhibit poor error correcting capabilities.• an energy efficient heating system• The passport office seems very efficient - I got a new passport in just 48 hours.• Thus, an efficient managerial labour market would be enough.• We need more efficient methods of transporting goods.• For a successful business, friendly and efficient staff are essential.• My new computer's much faster and more efficient than the old one was.• In its draft version the report declares that market forces alone will not ensure more efficient use of energy.• The doctor was cheerful and efficient, which immediately made me feel more relaxed.
energy efficient• An ecological building would also be moderately more energy efficient.• Automatic defrost is most desirable since it eliminates human error and is energy efficient.• Today's forward thinking manufacturers are already offering systems which include self-washing filter units and energy efficient airflow patterns.• Lighting is now more energy efficient and the heat that it produces can be used to heat stores in winter.• And therein lies the key criticism of Mr Lamont's move towards an energy efficient Britain.• Others would like their homes to be energy efficient but wanted the features to be incorporated into the basic house price.• The work will include cavity wall insulation, roof insulation, double glazing and installation of energy efficient heating systems.• Why not spend some of that money on improving public transport schemes - more energy efficient, safer and less polluting?
From Longman Business Dictionary
efficientef·fi·cient /ɪˈfɪʃənt/ adjectiveadjMANUFACTURING
1producing goods using as little time, money etc as possible
The United States has developed the most efficient methods of food production and distribution.
Is this really an efficient use of resources?
2cost-efficient, fuel-efficient etc costing as little as possible, using as little fuel as possible etc
energy-efficient light bulbs
3doing a job quickly and well
a very efficient young secretary
a fast and efficient transport system
—efficiently adverbadv
an efficiently run restaurant
equipment that distributes electrical power more efficiently
Origin efficient
(1300-1400) Latin present participle of efficere; → EFFECT1

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