capacity |kəˈpasitē|
noun ( pl. -ties)

1 [in sing. ] the maximum amount that something can contain : the capacity of the freezer is 1.1 cubic feet | the stadium's seating capacity | the room was filled to capacity.
[as adj. ] fully occupying the available area or space : they played to a capacity crowd.
the amount that something can produce : the company aimed to double its electricity-generating capacity | when running at full capacity, the factory will employ 450 people.
the total cylinder volume that is swept by the pistons in an internal combustion engine.
former term for capacitance.

2 the ability or power to do, experience, or understand something : I was impressed by her capacity for hard work | [with infinitive ] his capacity to inspire trust in others | their intellectual capacities.
[in sing. ] a person's legal competence : cases where a patient's testamentary capacity is in doubt.

3 [in sing. ] a specified role or position : I was engaged in a voluntary capacity | writing in his capacity as legal correspondent.

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In this specific case, the word is taking on the third definition. Hilarious that people think there wasn't enough of the first definition.