Noun
(Philippines, law enforcement) Abbreviation of jail officer, grade one (“prison guard”). The lowest grade of jail officers, the entry level jail officer.
Hypernyms: JO, jail officer
Coordinate term: JO2
(US, military, nautical, journalism) Abbreviation of journalist, petty officer, first class. A journalist of the U.S. Navy holding the rating of first class petty officer, the highest class of regular petty officer.
Hypernyms: PO1, PO, petty officer
Coordinate terms: PO2, CPO
Abbreviation of junior officer, 1. or junior officer, grade one or junior officer, first class; and similar
Hypernyms: JO, junior officer
Coordinate term: JO2
(medicine) Alternative form of Jo1
Source: en.wiktionary.org