knight errantry is a noun meaning "quixotic (romantic and impractical) behavior". It carries 2 recorded senses.
(Middle Ages) the code of conduct observed by a knight errant who is wandering in search of deeds of chivalry
Middle Ages
Definitions, synonyms and semantic relations for knight errantry come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.