Capacity

n. pl. Capacities (-tĭz).
  1. The power of receiving or containing; extent of room or space; passive power; -- used in reference to physical things.
  2. The power of receiving and holding ideas, knowledge, etc.; the comprehensiveness of the mind; the receptive faculty; capability of understanding or feeling.
  3. Ability; power pertaining to, or resulting from, the possession of strength, wealth, or talent; possibility of being or of doing.
  4. Outward condition or circumstances; occupation; profession; character; position; as, to work in the capacity of a mason or a carpenter.
  5. (Law) Legal or moral qualification, as of age, residence, character, etc., necessary for certain purposes, as for holding office, for marrying, for making contracts, wills, etc.; legal power or right; competency.
    6. Capacity for heat ,
    the power of absorbing heat. Substances differ in the amount of heat requisite to raise them a given number of thermometric degrees, and this difference is the measure of, or depends upon, what is called their capacity for heat. See Specific heat, under Heat.