1.
population
The number of people living in a particular area, country, or the world.
人口密度が高い。
The population density is high.
この市の人口は増えています。
The population of this city is increasing.
日本の人口は約1億2千万人です。
Japan's population is about 120 million people.
人口 is composed of 人 (person) + 口 (mouth/opening, here meaning 'count').
COMMON COLLOCATIONS:
- 人口が増える: population increases
- 人口が減る: population decreases
- 人口密度: population density
- 人口問題: population problem
- 高齢化人口: aging population
RELATED TERMS:
- 少子化: declining birthrate
- 過疎: depopulation (of rural areas)
- 過密: overcrowding