The term dilation may have a number of meanings:

In physiology, where it is synonymous with dilatation, it may mean:

• Pupil dilation of the eye
• Dilation of blood vessels (vasodilation)
• Cervical dilation (or dilation of the cervix) in childbirth
• Dilation and curettage (surgical dilation)
• Dilation following vaginoplasty

In mathematics:

• Dilation on a metric
• Dilation of an operator

In physics:

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

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

• Dilation (morphology)

In music:

• Dilate, a 1996 album by Ani DiFranco
• Dilate (musical project), a solo musical project by Victor Wulf of Vampire Rodents

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