Reduction (noun)

1. The action or process of making something smaller or less in amount, size, or degree.
2. A decrease in the amount, size, or degree of something.
3. A decrease in the cost of something.
4. The simplification of a mathematical equation or expression.

Origin:

From the verb reduce, which comes from the latin word "reducere" meaning "to bring back".

Examples:

1. The company implemented a reduction in staff.
2. The reduction in waste helped the company save money.
3. The reduction in carbon emissions is a critical step in addressing climate change.
4. There was a noticeable reduction in pain after taking the medication.
5. The reduction of the equation was very complicated.