say it: KUR-tuh-see
courtesy is a noun meaning "a courteous or respectful or considerate act". It carries 3 recorded senses.
a courteous or respectful or considerate act
a courteous or respectful or considerate remark
a courteous manner
Forms marked · are formed by the regular rule rather than recorded in the source data. English keeps a few hundred irregulars and the rest follow the pattern, so the rule is right far more often than not — but it is a rule, and the mark says so.
Definitions, synonyms and semantic relations for courtesy come from Princeton University’s WordNet. The pronunciation comes from the CMU Pronouncing Dictionary. Commonness is measured against a corpus of everyday English. Full sources and licences.