Definition of knell. 1  transitive verb. : 2  to summon or announce by or as if by a knell. 3  intransitive verb. 4  1 : to ring especially for a death, funeral, or disaster : toll. 5  2 : to sound in an ominous manner or with an ominous effect.
For the journal, see Demography (journal) . Demography is the statistical study of populations, including of human beings. As a very general science, it can analyze any kind of dynamic living population, i.e., one that changes over time or space (see population dynamics).
Category:Meteorologists. A meteorologist is a scientist who studies weather; and may, like a weather presenter (who often are not scientists) engage in weather forecasting, or may solely conduct research. Category:Climatologists is a closely related category of researchers in climatology, the study of climate.