• Pupillary dilation, dilation of the pupil of the eye
• Cervical dilation
  Cervical dilation
  Cervical dilation is the opening of the cervix, the entrance to the uterus, during childbirth, miscarriage, induced abortion, or gynecological surgery...
  
  , the widening of the cervix in childbirth, miscarriage etc.
• Dilation and curettage
  Dilation and curettage
  Dilation and curettage refers to the dilation of the cervix and surgical removal of part of the lining of the uterus and/or contents of the uterus by scraping and scooping . It is a diagnostic gynecological procedure.D&C normally is referred to a procedure involving a curette, also called sharp...
  
  , the opening of the cervix and surgical removal of the contents of the uterus
• Dilation and evacuation
  Dilation and evacuation
  Dilation and evacuation literally refers to the dilation of the cervix and surgical evacuation of the contents of the uterus...
  
  , the dilation of the cervix and evacuation of the contents of the uterus
• Vasodilation
  Vasodilation
  Vasodilation refers to the widening of blood vessels resulting from relaxation of smooth muscle cells within the vessel walls, particularly in the large arteries, smaller arterioles and large veins. The process is essentially the opposite of vasoconstriction, or the narrowing of blood vessels. When...
  
  , the widening of luminal diameter in blood vessels

• 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)
  Dilation (morphology)
  Dilation is one of the basic operations in mathematical morphology. Originally developed for binary images, it has been expanded first to grayscale images, and then to complete lattices...
  
  , an operation in mathematical morphology
• Scaling (geometry)
  Scaling (geometry)
  In Euclidean geometry, uniform scaling is a linear transformation that enlarges or shrinks objects by a scale factor that is the same in all directions. The result of uniform scaling is similar to the original...
  
  , 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

• Scale invariance
  Scale invariance
  In physics and mathematics, scale invariance is a feature of objects or laws that do not change if scales of length, energy, or other variables, are multiplied by a common factor...
  
  , a feature of objects or laws that do not change if length scales (or energy scales) are multiplied by a common factor
• Time dilation
  Time dilation
  In the theory of relativity, time dilation is an observed difference of elapsed time between two events as measured by observers either moving relative to each other or differently situated from gravitational masses. An accurate clock at rest with respect to one observer may be measured to tick at...
  
  , the observation that another's clock is ticking at a slower rate as measured by one's own clock

• Dimensional variation, the variation of physical dimensions in response to application or removal of heat

Dilate

• Dilate (Bardo Pond album)
  Dilate (Bardo Pond album)
  Dilate is the fifth album by Bardo Pond. It was released on April 24, 2001 on Matador Records.-Track listing:#"Two Planes - 7:26#"Sunrise" - 5:26#"Inside" - 11:43#"Aphasia" - 6:02#"Favorite Uncle" - 5:58#"Swig" - 4:22#"Despite the Roar" - 7:07...
  
   – Bardo Pond album
• Dilate (Ani DiFranco album) – Ani DiFranco album
• Dilate (musical project)
  Dilate (musical project)
  Dilate was an ambient solo project begun in 1996 by keyboard player Victor Wulf.-History:Wulf began writing music in 1977. After working with experimental industrial band Vampire Rodents, he released his first album under the name Dilate, Cyclos, in early 1996. The follow-up, Octagon, was...
  
  – ambient solo project of Vampire Rodents keyboardist Victor Wulf