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Definition of Petty officer first class
1. Noun. (Canada Navy) A warrant officer in the Canadian Forces Maritime Command, ranking above petty officer second class and below chief petty officer second class. ¹
2. Noun. (US Navy) A non-commissioned officer in the United States Navy and United States Coast Guard, ranking above petty officer second class and below chief petty officer. ¹
¹ Source: wiktionary.com