1 [C,U] the number of people who live in a particular area, city or country （某地方的）人口，居民人数: What is the population of your country? 你们国家有多少人口？an increase/a fall in population 人口的增加╱减少

2 [C] all the people who live in a particular place or all the people or animals of a particular type that live somewhere （居住在某地的）全部人或动物: the local population 当地居民the male/female population 男性╱女性居民The prison population has increased in recent years. 最近几年监狱犯人增加了。