The difference between Commissioned officer and Petty officer
When used as nouns, commissioned officer means an officer who derives authority directly from a sovereign power and, as such, holds a commission charging them with the duties and responsibilities of a specific office or position, whereas petty officer means a non-commissioned officer in the canadian, us and uk navy and the us coast guard.
check bellow for the other definitions of Commissioned officer and Petty officer
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Commissioned officer as a noun (military):
An officer who derives authority directly from a sovereign power and, as such, holds a commission charging them with the duties and responsibilities of a specific office or position.
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Petty officer as a noun:
A non-commissioned officer in the Canadian, US and UK Navy and the US Coast Guard; roughly equivalent to a sergeant in the army