The word "increase" means to become larger or greater in size, amount, number, or degree. It can be used as a verb or a noun.

As a verb:

• To make something bigger or more.
• Example: The company plans to increase its production next year.

As a noun:

• The act or process of becoming larger or greater.
• Example: There was an increase in sales last month.

In summary, "increase" refers to growth or expansion in quantity or intensity.