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knight-errantry

[nahyt-er-uh n-tree]
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noun, plural knight-er·rant·ries.
  1. the behavior, vocation, or character of a knight-errant.
  2. quixotic conduct or action.

Origin of knight-errantry

First recorded in 1645–55; knight-errant + -ry
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
British Dictionary definitions for knight errantry

knight errantry

noun
  1. the practices of a knight errant
  2. quixotic behaviour or practices
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012