JAG en · NOUN Meanings (US, abbreviation, acronym, alt-of, countable, uncountable) Acronym of judge advocate general. alt of judge advocate general Of the three JAGs who were dismissed, I know Lt. Gen. Charles Plummer and worked with him for more than three years. 2025 February 24, Frank Kendall, “America Has a Rogue President”, in The New York Times, →ISSN: Forms SpellingFeaturesLabelsSource JAGs Number=Plur lexicographic