democracy (noun):
Government by the people, especially as exercised by elected representatives.
A system of government in which the power is vested in the people.
demography (noun):
The scientific study of population statistics.
The study of statistics such as births, deaths, income, or disease, especially those affecting a specific population.
epidemic (noun):
A widespread occurrence of an infectious disease in a community at a particular time.
A sudden, widespread outbreak of a disease that affects many people at the same time.
endemic (adjective):
(of a disease or condition) regularly found among particular people or in a certain area.
Regularly found among a particular group of people or in a certain area.
pandemic (noun):
A disease prevalent over a whole country or the world.
A disease that affects a large number of people over a wide area.