IPA: /ˌpɒp.jʊˈleɪ.ʃən.əl/
KK: /ˌpɑp.jəˈleɪ.ʃən.əl/
Relating to the number of people living in a particular area or the characteristics of a group of people.
The populational studies showed a significant increase in the city's residents over the last decade.
Populational → It is formed from "populus" (meaning people) and the suffix "-ational" (meaning relating to). The word "populational" refers to something that is related to or concerning a population of people.
Think of 'populus' meaning 'people' and remember that 'populational' relates to a group of people.