1(in the Middle Ages) a man who served his sovereign or lord as a mounted soldier in armour.
(in the Middle Ages) a man raised by a sovereign to honourable military rank after service as a page and squire.
(also knight of the shire) historical a gentleman representing a shire or county in Parliament.
literary a man devoted to the service of a woman or a cause:in all your quarrels I will be your knight
2(in the UK) a man awarded a non-hereditary 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. Each player starts the game with two knights.
4(in ancient Rome) a member of the class of equites.
(in ancient Greece) a citizen of the second class in Athens, called hippeus in Greek.
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Universal
invest (someone) with the title of knight:he was knighted for his services to industry
knight in shining armour (or knight on a white charger)
an idealized or chivalrous man who comes to the rescue of a woman in a difficult situation.
knight of the road
informal a man who frequents the roads, for example a travelling sales representative, tramp, or (formerly) a highwayman.
