n.
     - (in the Middle Ages) a man raised 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 a cause or the service of a woman.
 - (in the UK) a man awarded a non-hereditary title by the sovereign and entitled to use the honorific ‘Sir’ in front of his name.
 - a chess piece, typically shaped like a horse's head, that moves by jumping to the opposite corner of a rectangle two squares by three.
 - (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.
 
v.
 invest with the title of knight.
 
  Phrase
  
    - knight in shining armour 
(or knight on a white charger)
 an idealized chivalrous man.  - knight of the road
 informal a man who frequents the roads, e.g. a salesman, tramp, or (formerly) a highwayman. 
   
  Derivative
  
    - knightliness n.
  - knightly adj.
 
   
  Etymology
  OE cniht ‘boy, youth, servant’, of W. Gmc origin.