noun, plural knight-er·rant·ries.
the behavior, vocation, or character of a knight-errant.
quixotic conduct or action.
Origin of knight-errantry
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
the practices of a knight errant
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