n.

1. 人口[U][C]
   The population of this country rose by 10 percent.

   这个国家的人口增长了百分之十。

   The country has a population of 100 million.

   这个国家有一亿人口。

2. （某地域的）全部居民[the S][G]
   Only ten percent of the population here is illiterate.

   这里只有百分之十的居民是文盲。

3. （具有共同特色的）人们；（某地域的）特定居民[the S][G]
4. （某地区某类）动物（或植物）的总数；（某地区某类）物品的总数[the S][G]
   The elephant population in that area is falling.

   那个地区的大象总数在下降。

5. 【生】族群
6. 【统】（对象）总体，母体

n.

1. all the inhabitants of a particular place.
   ▸a particular group within this.
   ▸the action of populating an area.
2. Biology  a community of interbreeding organisms.
3. Statistics  a finite or infinite collection of items under consideration.