chief petty officer

Short definition from Wiktionary

Noun

1. 1
   A warrant officer belonging to one of the two classes of chief petty officer: chief petty officer first class and chief petty officer second class.
2. 2
   A non-commissioned officer in the Royal Navy, ranking above petty officer and below warrant officer class 2.
3. 3
   A non-commissioned officer in the United States Navy and United States Coast Guard, ranking above petty officer first class and below senior chief petty officer.