1 (wiktionary) 2 (vi.wikipedia) 3 (en.wikipedia) 4 (glosbe)

Verbs Nouns Adjectives/Adverbs Pronouns Prepositions Conjunctions
efficiency (Advanced search)

NGSL3000 efficiency working well; producing something without waste n
SAT5000 inefficiency That which does not accomplish an intended purpose. n.

efficiency {n} Effizienz inefficiency {n} (degree or measure of someone or something's lack of efficiency or effectiveness)