variant of 1. (by assimilation) before f: efficient.
efficiency (apartment)
emission factor

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    abbreviation 1. essential fatty acid noun 2. European Fighter Aircraft 1. Epilepsy Foundation of America 2. essential fatty acids

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    [ef] /ɛf/ Slang. verb (used with or without object), interjection 1. : Stop effing around and get to work! Eff you, you lout! noun 2. the word “fuck”; the f-word: peppering his speech with superfluous and highly offensive effs. Verb phrases 3. eff off, Go away!: Eff off and die, you piece of Martian scum! […]

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