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in the PONS Dictionary

ef·fi·cient [ɪˈfɪʃənt] ADJ

1. efficient (productive):

efficient
leistungsfähig
efficient
leistungsstark form
efficient
effizient
efficient person
fähige [o. tüchtige] Person

2. efficient (economical):

efficient
wirtschaftlich

ˈen·er·gy ef·fi·cient ADJ

energy efficient
energiesparend attr
energy efficient
sparsam im Energieverbrauch pred

ˈen·er·gy-ef·fi·cient ADJ

energy-efficient food, drink:

energy-efficient
Energie spendend attr
to be energy-efficient
Energie spenden

fuel-efˈficient ADJ inv

fuel-efficient
Benzin sparend

efficient technology

efficient technology
effiziente Technologie

energy-efficient ADJ

energy-efficient
energieeffizient (sparsam im Umgang mit Energie)

highly efficient ADJ MKTG

highly efficient
hocheffizient

risk-efficient ADJ FINMKT

risk-efficient
risikoeffizient

efficient market theory N FINMKT

efficient market theory (Theorie, die davon ausgeht, dass der Kurs einer Aktie ihrem tatsächlichen Wert entspricht)
Efficient Market Theory f