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).
Name of someone who studies space? Astronomer or Astrophysicist. An astronomer is more focused on studies of the objects IN space, the stars, planets, asteroids, comets, and assorted space rocks. An astrophysiâ¦cist is more interested in how stars work; the underlying core of the nuclear fusion process.