In mathematics:

A dilations is a increasing a points distance from the origin by a given factor, K. Dilations can be done to a single point or a set of points. The notation for a dilation is D_k In music:

In physics:

The term dilation may have a number of meanings: In physiology, where it is synonymous with dilatation, it may mean:

Time dilation

Dilation of blood vessels (vasodilation)

Dilation following vaginoplasty

Dilation and curettage (surgical dilation)

Pupil dilation (mydriasis)

Dilation (morphology)

Dilation of an operator

Dilation on a metric

Cervical dilation (or dilation of the cervix) in childbirth

Dilation (or dilatation) is a scaling transformation (see scale invariance and conformal symmetry)

In morphological image processing (a subset of digital image processing):

Dilate, a 1996 album by Ani DiFranco