As a noun, capacity means the total amounts that can be produced or contained.

The farm is working at full capacity. It can't produce any more milk. The export capacity of the country has increased in recent years.

Also, as a noun, capacity is a person's ability to do something. You can get the promotion. The

skills needed are not beyond your capacity. You have to work within the capacity of your abilities.

Capacity is frequently used in the phrase at capacity, which means full. We can also say

reach capacity, which means become full. There are no tickets left. The stadium is at capacity. This class has reached capacity.

I'll add you to the waiting list. We hope understanding this lesson isn't beyond your capacity.