In the middle ages a knight was defined as a nobleman who served a king as a mounted man-of-arms; but today, a knight is used to refer to someone who has been honored by the monarch of England for their achievements.(noun)
The definition of knight is to give someone the honor of being called "knight."(verb)
When the queen of England honored Sir Elton John for his contributions to music and made him a "knight," this is an example of the Queen doing the act of knighting him.
See knight in Webster's New World College Dictionary
Origin: ME kniht < OE cniht, boy, retainer, akin to Ger knecht, lad, servant < IE *gnegh-: for base see knead
See knight in American Heritage Dictionary 4
Origin: Middle English
Origin: , from Old English cniht.
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