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first officer
avia. 副驾驶; 大副; 副驾驶员
tech. 大副【船
 English thesaurus
first officer
avia., Canada A licensed pilot assigned to duty as a pilot in an aircraft during flight time, other than as a a pilot-in-command; or b a pilot receiving flying instruction
First Officer also called a co-pilot
abbr., avia. FO (второй пилот Val_Ships)