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Tightness may refer to:

In mathematics,

• Tightness of (a collection of) measures is a concept in measure (and probability) theory
• Tightness (topology) is also a cardinal function used in general topology

In economics,

• Tightness refers to the degree to which the number of unemployed workers exceed the number of posted job vacancies (or vice versa).
• Market tightness, a point in time where it is very difficult to invest, but it is far easier to sell or to remove investments in return of monetary rewards

In other fields,

• Tightness of a rope indicates the rope is under tension
• Tightness of a sealing means it is impermeable, that it seals well
• Tightness is the art of being 'tight' (i.e., stingy or miserly)
• Tightness can refer to something being cool

See also

• Tight (disambiguation)

• Disambiguation pages