0 the study of changes in the number of births, marriages, deaths, etc. in a particular area during a period of time: --
1 the study of people in a particular area, to discover how many have particular characteristics and to record changes in the number of males, females, births, marriages, deaths, etc.: --
Demography is the statistical study of human populations.
2 the number and characteristics of people in a particular area, for example, their ages, sex, and whether or not they are married: --
We can complete it step by step however long the road is and it can't be completed however short the road is if you don't even mark your footprint.
Vi kan slutföra det steg för steg hur lång vägen än är och den kan inte slutföras hur kort vägen än är om du inte ens markerar ditt fotavtryck.