The statement "The establishment of the daimyo in medieval Japan contributed to warring kingdoms and a breakdown in the central government. is true.
From the 12th to the 19th centuries, a daimyo was a feudal lord in Japan's shogunate. Large landowners and shogun's vassals, the daimyos were. To safeguard the lives and possessions of his family, each daimyo hired a samurai army.
The Japanese roots "dai," which means "large or great," and "myo," which means "name," are where the word "daimyo" originates. In English, it basically translates as "excellent name." However, in this context, "myo" implies something akin to "title to land," therefore the phrase really relates to the daimyo's substantial landholdings and is most likely literally translated as "owner of big land."
Since "lord" was also used during the same era in Europe, "daimyo" is the closest English counterpart.
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