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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: 3 phrases in 3 subjects

Abbreviation	1
Energy industry	1
General	1