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Definition of knight
1(in the Middle Ages) a man who served his sovereign or lord as a mounted soldier in armor. (in the Middle Ages) a man raised by a sovereign to honorable military rank after service as a page and squire. literary a man devoted to the service of a woman or a cause:in all your quarrels I will be your knight dated (in ancient Rome) a member of the class of equites. (in ancient Greece) a citizen of the second class in Athens.
2(in the UK) a man awarded a nonhereditary title by the sovereign in recognition of merit or service and entitled to use the honorific “Sir” in front of his name. 3a chess piece, typically with its top shaped like a horse’s head, that moves by jumping to the opposite corner of a rectangle two squares by three.
verb [with object] (usually be knighted)
invest (someone) with the title of knight.