Definition of petty officer third class
: an enlisted man in the navy or coast guard ranking above a seaman and below a petty officer second class
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“Petty officer third class.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/petty%20officer%20third%20class. Accessed 18 May. 2022.
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The first known use of petty officer third class was in 1898
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