courtesy noun

ADJ. great, unfailing, utmost | common It's common courtesy to warn your neighbours if your children are going to have a party. | exaggerated He apologized with exaggerated courtesy.

VERB + COURTESY do sb, have, show, treat sb with She might have done me the courtesy of replying to my letter. You could at least have had the courtesy to let me know.

PREP. with ~ He listened to all the complaints with great courtesy. | ~ to her unfailing courtesy to everyone

PHRASES a matter of courtesy It's a matter of courtesy to write and thank people after a party.