Dilation
Dilation (or dilatation) may refer to:

Physiology or medicine
Cervical dilation, the widening of the cervix in childbirth, miscarriage etc.
Coronary dilation, or coronary reflex
Dilation and curettage, the opening of the cervix and surgical removal of the contents of the uterus
Dilation and evacuation, the dilation of the cervix and evacuation of the contents of the uterus
Esophageal dilatation, a procedure for widening a narrowed esophagus
Pupillary dilation (also called mydriasis), the widening of the pupil of the eye
Vasodilation, the widening of luminal diameter in blood vessels

Mathematics
Dilation (affine geometry), an affine transformation
Dilation (metric space), a function from a metric space into itself
Dilation (operator theory), a dilation of an operator on a Hilbert space
Dilation (morphology), an operation in mathematical morphology
Scaling (geometry), including:
Homogeneous dilation (homothety), the scalar multiplication operator on a vector space or affine space
Inhomogeneous dilation, where scale factors may differ in different directions

Chemistry and physics
Thermal expansion of crystalline triglycerides is referred to as dilation
Scale invariance, a feature of objects or laws that do not change if length scales (or energy scales) are multiplied by a common factor
Time dilation, the observation that another's clock is ticking at a slower rate as measured by one's own clock

Music
Dilate (Bardo Pond album)
Dilate (Ani DiFranco album)
Dilate (musical project), ambient solo project of Vampire Rodents keyboardist Victor Wulf
Dilation (album), 2011 album by comedian Rory Scovel

See also
Dilution (disambiguation)