capacity

Capacity is the ability of someone or something to hold something. (noun)

See capacity in Webster's New World College Dictionary

noun pl. capacities

the ability to contain, absorb, or receive and hold
1. the amount of space that can be filled; room for holding; content or volume: a tank with a capacity of 21 gallons
2. the point at which no more can be contained: filled to capacity
the power of receiving and holding knowledge, impressions, etc.; mental ability
the ability or qualifications (for, or to do, something); aptitude
maximum output or producing ability: operating at capacity
the quality of being adapted (for something) or susceptible (of something); capability; potentiality
a condition of being qualified or authorized; position, function, status, etc.: acting in the capacity of an advisor
Elec. capacitance
Law legal authority or competence

See capacity in American Heritage Dictionary 4

(kə-păsˈĭ-tē)

noun pl. ca·pac·i·ties

a. The ability to receive, hold, or absorb.
b. Abbr. c. A measure of this ability; volume.
The maximum amount that can be contained: a trunk filled to capacity.
a. Ability to perform or produce; capability.
b. The maximum or optimum amount that can be produced: factories operating below capacity.
The power to learn or retain knowledge; mental ability.
Innate potential for growth, development, or accomplishment; faculty. See Synonyms at ability.
The quality of being suitable for or receptive to specified treatment: the capacity of elastic to be stretched.
The position in which one functions; role: in your capacity as sales manager.
Legal qualification or authority: the capacity to make an arrest.
Electricity Capacitance.