Source: The Collins English Dictionary © 2000 HarperCollins Publishers:

demotic [dý'mɒtýk]
adjective
1 of or relating to the common people; popular

2 of or relating to a simplified form of hieroglyphics used in ancient Egypt by the ordinary literate class outside the priesthood
Compare: hieratic
noun
3 the demotic script of ancient Egypt
[ETYMOLOGY: 19th Century: from Greek demotikos of the people, from demotes a man of the people, commoner; see demos]
de'motist noun