What is Capacity ?
Capacity is (noun) 1. an amount which something can hold This barrel has a larger capacity than that one. The cinema was filled to capacity. capacity audience, capacity crowd an audience which fills a building such as a cinema or theatre to work at full capacity to do as much work as possible 2. engine capacity the output of an engine or electric motor 3. an ability to do something easily He has a capacity for making friends with anyone he meets. 4. a position acting in his capacity as manager acting as a manager speaking in an official capacity speaking officially
source: Easier English, Student Dictionary Upper Intermediate Level