It often appears in words related to population, society, or the common good. Here are some examples:
* Pandemic: A disease that affects a large population, spreading across a wide geographic area.
* Epidemic: A disease that spreads rapidly among a large number of people in a particular region.
* Endemic: Something that is native or prevalent in a particular region or people.
* Demography: The study of statistics related to human populations, such as age, sex, and income.
* Democracy: A system of government where supreme power is vested in the people and exercised by them directly or indirectly through a system of representation.
So, when you see "demic" in a word, think of it as referring to people or the common people in some way.