Definition and pronunciation
capacity — noun: the ability to hold, do, or produce something; the maximum amount something can contain; a person’s legal or mental ability to act; a role or function (as in “in my capacity as…”).
Pronunciation: /kəˈpæsɪti/.
Easy explanation
Capacity is how much something can hold or handle, or what someone is able to do. A stadium has a seating capacity; a battery has capacity for energy; a person has the capacity to make decisions.
Part of speech and grammar
- Count/uncount noun: capacity; capacities.
- Frames: capacity for [noun/-ing] (capacity for change), capacity to [verb] (capacity to consent), in one’s capacity as [role], at/to capacity (full), of [number] capacity (a tank of 50-liter capacity).
- Related words: capable, capability, capacious, capacitance (physics), capacity-building.
Register and tone
Neutral and widely used across everyday, technical, legal, and medical contexts.
Connection to sexuality
Yes, in consent language. Capacity to consent means a person can understand, decide, and communicate a voluntary “yes” or “no.” Without legal/mental capacity (e.g., due to age or impairment), consent is invalid.
Common collocations
seating capacity; storage capacity; battery capacity; network capacity; hospital capacity; ICU capacity; full capacity; over capacity; spare capacity; production capacity; legal capacity; mental capacity; capacity to consent; capacity for empathy/learning; in the capacity of/as; capacity crowd; capacity planning; capacity building.
Idioms and expressions
- in my capacity as — acting in a particular role.
- at full capacity — operating at the maximum.
- beyond capacity — more than can be handled.
- a capacity crowd — a sold-out audience.
- capacity to consent — legal/ethical phrase in health and relationships.
Prepositions and nuance
- capacity for (general ability): capacity for love/innovation.
- capacity to (specific action): capacity to decide/reason/consent.
- in one’s capacity as (role): in her capacity as counselor.
- at/to capacity (full): the venue is at capacity.
- within/beyond capacity (limit): work within capacity; demand beyond capacity.
- of [X] capacity (measurement): a drive of 1 TB capacity.
Word comparisons
- capacity vs capability — capacity is limit/ability or maximum volume; capability is what a system is designed to do (feature set).
- capacity vs ability — ability is personal skill; capacity can be potential or limit (human or system).
- capacity vs competence/competency — competence is demonstrated skill meeting a standard; capacity can be potential or legal fitness.
- capacity vs volume — volume is physical space; capacity is the maximum volume or output.
- capacity vs bandwidth/throughput — capacity is the limit; throughput is actual flow achieved.
Real-life examples
- The shelter is at capacity after the storm.
- The new battery has higher capacity and lasts longer.
- She spoke in her capacity as union representative.
- Clinicians checked that each participant had the capacity to consent.
- The hospital expanded ICU capacity during flu season.
Sample sentences
- Please don’t exceed the elevator’s stated capacity.
- He has the capacity to lead under pressure.
- The app struggled when user traffic reached capacity.
- In her capacity as HR director, she updated the policy.
- Ethically, consent requires both willingness and capacity.
Synonyms
ability, capability, competence, competency, aptitude, potential, power, fitness, authorization, role, function, volume, size, space, limit, maximum, throughput, bandwidth, headroom
Antonyms
incapacity, inability, incompetence, powerlessness, unfitness, limitation, constraint, shortage, undercapacity, overload, saturation
Related terms
consent, legal capacity, mental capacity, agency, autonomy, informed consent, competence, guardianship, bandwidth, throughput, volume, storage, scalability, capacity planning, capacity building
Notes and etiquette
When discussing consent, be precise: capacity means understanding, voluntariness, and the ability to communicate a choice. In technical writing, distinguish capacity (limit) from performance/throughput (actual results).
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