Definition of "Capacity" :

noun: a specified function

"He was employed in the capacity of director."

noun: the maximum production possible

"The plant is working at 80 per cent capacity."

noun: tolerance for alcohol

"He had drunk beyond his capacity."

noun: capability to perform or produce

"Among his gifts is his capacity for true altruism."

noun: the power to learn or retain knowledge; in law, the ability to understand the facts and significance of your behavior

noun: an electrical phenomenon whereby an electric charge is stored

noun: (computer science) the amount of information (in bytes) that can be stored on a disk drive

"The capacity of a hard disk drive is usually expressed in megabytes."

noun: the amount that can be contained

"The gas tank has a capacity of 12 gallons."

noun: the susceptibility of something to a particular treatment