Definition of courteous adjective from the Oxford Advanced Learner's Dictionary

 

courteous

 adjective
adjective
BrE BrE//ˈkɜːtiəs//
 
; NAmE NAmE//ˈkɜːrtiəs//
 
 
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polite, especially in a way that shows respect a courteous young man The hotel staff are friendly and courteous. opposite discourteous Word Origin Middle English (meaning ‘having manners fit for a royal court’): from Old French corteis, based on Latin cohors ‘yard, retinue’. The change in the ending in the 16th cent. was due to association with words ending in -eous.Extra examples She was unfailingly courteous and helpful. He was a gentle, courteous man. I wrote him a short letter and received a courteous reply. The hotel staff were friendly and courteous.
See the Oxford Advanced American Dictionary entry: courteous