Meaning of “courtesy” - Learner’s Dictionary

courtesy

noun uk us /ˈkɜːtəsi/

B2 [ U ] behaviour that is polite and shows respect, or a polite action or remark:

The hotel treats all guests with courtesy.
[ + to do sth ] He didn't even have the courtesy to thank me.
(by) courtesy of sb/sth

If you have something courtesy of someone, they have allowed you to have it:

The photograph is courtesy of the Natural History Museum.

(Definition of “courtesy” from the Cambridge Learner’s Dictionary © Cambridge University Press)