Entry 1 sense Webster, 1913 cedilla /(sē̇*dĭl"lȧ)/ · ce·dil·la · IPA /səˈdɪlə/ 01 n. A mark placed under the letter c [thus, ç], to show that it is to be sounded like s, as in façade. 1. A mark placed under the letter c [thus, ç], to show that it is to be sounded like s, as in façade.