Definition of generalissimo noun from the Oxford Advanced Learner's Dictionary

 

generalissimo

 noun
noun
BrE BrE//ˌdʒenrəˈlɪsɪməʊ//
 
; NAmE NAmE//ˌdʒenrəˈlɪsɪmoʊ//
 
(pl. generalissimos)(from Italian)
 
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a person who commands all the armed forces of a country, especially one who has political as well as military power Word Origin early 17th cent.: Italian, ‘having greatest authority’, superlative of generale (see general).
See the Oxford Advanced American Dictionary entry: generalissimo