ce ‧ dil ‧ la /sɪˈdɪlə/ BrE AmE noun [countable]
[ Date: 1500-1600 ; Language: Spanish ; Origin: 'the letter ç (an old form of the letter z)' , from ceda 'the letter z' from Late Latin zeta , from Greek ]
a mark under the letter ‘c’ in French and some other languages, to show that it is an ‘s’ sound instead of a ‘k’ sound. The letter is written ‘ç’.