The definition of courteous is a polite and considerate person.(adjective)
An example of courteous is someone letting a pregnant woman go ahead of them in line for the restroom.
See courteous in Webster's New World College Dictionary
Origin: ME courteis < OFr corteis < court: see court & -eous
See courteous in American Heritage Dictionary 4
Origin: Middle English corteis, courtly
Origin: , from Old French
Origin: , from cort, court; see court.
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