An example of courteous is someone letting a pregnant woman go ahead of them in line for the restroom.
Origin of courteousMiddle English courteis from Old French corteis from court: see court and -eous
Origin of courteousMiddle English corteis courtly from Old French from cort court ; see court .
(comparative more courteous, superlative most courteous)
From Old French curteis (French courtois), from cort (“court”), displaced native Old English hende (“courteous, gracious, friendly”).