Swelling (noun)

1. The act or process of becoming larger, especially due to an increase in size.
2. The state or condition of being larger than the normal size.
3. An enlargement or increase in the size of something due to a build-up of fluid, gas or air.
4. A lump, bump or protuberance that forms on or in the body due to an injury or disease.
5. An increase or expansion in the amount of something.

Origin:

From the old english word swellian meaning "to grow or increase".

Examples:

1. The swelling in his ankle was due to a sprain.
2. The swelling of the river was due to heavy rain.
3. The swelling of the population has put pressure on the resources.
4. The swelling of the company was due to the acquisition of several smaller firms.
5. The swelling of pride was evident in her smile.