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proof [pru:f] n
econ.	доказ
English thesaurus
proof [pru:f] abbr.
abbr.	pf
law	conclusive evidence; Any fact or evidence that leads to a judgment of the court; evidence convincing to the judge or jury
mil., abbr.	prf
USA	To verify that a breached lane is free of live mines by passing a mine roller or other mine-resistant vehicle through as the lead vehicle (JP 3-15)

proof: 3 phrases in 3 subjects

Electric machinery	1
Electric motors	1
Electrical engineering	1