The term dilation may have a number of meanings:

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

• Pupil dilation (mydriasis)
• 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

In physics:

• Time dilation

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

• Dilation (morphology)

Dilatation | Dilatation