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English thesaurus
efficiency [ɪ'fɪʃ(ə)nsɪ] abbr.
abbr.	effy (Vosoni)
abbr., el.	η
abbr., met.	e.
abbr., mil.	effcy; eff
abbr., mining.	effic.
abbr., polym.	eff.; effy

efficiency : 56 phrases in 11 subjects

Chemistry	1
Economics	3
Electronics	4
Energy industry	22
Environment	10
Finances	5
General	1
Microsoft	1
Natural sciences	1
Trade unions	3
Transport	5