ca·pac·i·ty 
(kə-păsĭ-tē)
(kə-păsĭ-tē)n. pl. ca·pac·i·ties
1.
a. The ability to receive, hold, or absorb something: the storage capacity of a car's trunk.
b. The maximum amount that can be contained: a bin filled to capacity.
2. The power to learn or retain knowledge; mental ability.
3.
a. The ability to do, make, or accomplish something; capability: a comedian's capacity for making people laugh.
b. The maximum or optimum amount that can be produced: factories operating below capacity.
4. The quality of being suitable for or receptive to specified treatment: the capacity of elastic to be stretched.
5. The position in which one functions; role: in your capacity as sales manager.
6. Legal qualification or authority: the capacity to make an arrest.
7. Electricity Capacitance.
adj.
Filling a space with the most it can hold: a capacity crowd at the concert.
[Middle English capacite, from Old French, from Latin capācitās, from capāx, capāc-, spacious; see CAPACIOUS.]