Population

noun

1. The people living within a political or geographical boundary.

   "The population of New Jersey will not stand for this!"

2. (by extension) The people with a given characteristic.

   "India has the third-largest population of English-speakers in the world."

3. A count of the number of residents within a political or geographical boundary such as a town, a nation or the world.

   "The town’s population is only 243."

4. A collection of organisms of a particular species, sharing a particular characteristic of interest, most often that of living in a given area.

   "A seasonal migration annually changes the populations in two or more biotopes drastically, many twice in opposite senses."

5. A group of units (persons, objects, or other items) enumerated in a census or from which a sample is drawn.