de ‧ mog ‧ ra ‧ phy /dɪˈmɒɡrəfi $ -ˈmɑː-/ BrE AmE noun [uncountable]
[ Date: 1800-1900 ; Language: French ; Origin: démographie , from Greek demos 'people' ]
the study of human populations and the ways in which they change, for example the study of how many births, marriages and deaths happen in a particular place at a particular time
—demographer noun [countable]