ultraefficient

adjective
ul·​tra·​ef·​fi·​cient | \ ˌəl-trə-i-ˈfi-shənt How to pronounce ultraefficient (audio) \

Definition of ultraefficient

: producing desired effects with very little or no waste an ultraefficient engine

First Known Use of ultraefficient

1890, in the meaning defined above

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The first known use of ultraefficient was in 1890

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