late 15c., "well-mannered, courteous, having manners befitting a court," from court (n.) + -ly (1). Compare courteous. Meaning "pertaining to the court" is from late 15c. The elegant, polite, refined courtly love "highly conventionalized medieval chivalric love" (amour courtois) is attested from 1821. Related: Courtliness.
a courtly gentleman
courteous
courtesan
courtesy
courthouse
courtier
courtly
court-marshal
court-martial
courtroom
courtship
courtyard
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