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economical
mastery UK /ˌiː.kəˈnɒm.ɪ.kəl/ US /ˌɛk.əˈnɑ.mɪ.kəl/adj
card 1 of 3 · preposition
Our new refrigerator is more economical _____ energy than the old one.
card 1 of 3 · preposition
Our new refrigerator is more economical _____ energy than the old one.