noun.
A mark ( ¸ ) placed beneath the letter c, as in the spelling of the French word garçon, to indicate that the letter is to be pronounced (s).
The Century Dictionary and Cyclopedia
noun.
A mark placed under the letter c (thus, ç), especially in French and Portuguese, and formerly in Spanish, before a, o, or u, to indicate that it is to be sounded like s, and not like k, as it usually is before those vowels.
the GNU version of the Collaborative International Dictionary of English
noun.
A mark placed under the letter c [thus, ç], to show that it is to be sounded like s, as in façade.
noun.
In the spelling of Catalan, French, Portuguese and some other languages, a mark sometimes placed under the letter c to indicate that it is pronounced /s/ rather than /k/, as in French menaçant and Portuguese almoço, and also used in various other languages to change the sounds of other letters.
WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
noun.
a diacritical mark (,) placed below the letter c to indicate that it is pronounced as an s
Word Usage
"The cedilla is also used in portuguese by the way."