daimyoPronunciation: /ˈdʌɪmɪəʊ, ˈdʌɪmjəʊ/ (also daimio)Definition of daimyo noun (plural same or daimyos) (in feudal Japan) one of the great lords who were vassals of the shogun. Origin:Japanese, from dai 'great' + myō 'name'daimyo in other Oxford dictionaries Definition of daimyo in the US English dictionary