noun
plural -sies
[noncount] :polite behavior that shows respect for other people
[count] something that you do because it is polite, kind, etc.
something that you say to be polite especially when you meet someone
courtesy of
If you say that something has been provided through the courtesy of or (by) courtesy of a person, organization, business, etc., you are politely saying that they paid for it, gave it, or let it be used.
adjective
always used before a noun
done in order to be polite
provided for free