Reduce (verb)

1. Make smaller or less in amount, degree, or size.
2. Simplify (a problem or mathematical expression) by substituting one term for another of equivalent value.

Origin:

Late middle english: from latin reducere, from re- "back" + ducere "to lead".

Examples:

1. He reduced the amount of sugar in the recipe.
2. The new law will reduce pollution.
3. She reduced her expenses by cutting back on dining out.
4. The mathematician reduced the equation to a simpler form.
5. The company reduced their workforce by 20%.