武ぶ士し階かい級きゅう

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きゅ

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Meanings

1

noun

warrior class; samurai class

Refers to the historical social class of warriors in Japan, especially during the feudal period.

warrior, military, chivalry

士gentleman, scholar, samurai

階storey, stair, counter for storeys of a building

級class, rank, grade

武ぶ士し
武士 refers to an individual warrior or samurai, while 武士階級 refers to the warrior class as a whole.
士し族ぞく
士族 is the formal term for the samurai class after the Meiji Restoration, whereas 武士階級 is a broader historical term.

Compound of 武士 (warrior) and 階級 (class, rank).