Dilation
wiktionary: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 ...
(or dilatation) may refer to:
Physiology or medicine
*
Cervical dilation
Cervical dilation (or cervical dilatation) is the opening of the cervix, the entrance to the uterus, during childbirth, miscarriage, induced abortion, or gynecological surgery. Cervical dilation may occur naturally, or may be induced surgically ...
, the widening of the cervix in childbirth, miscarriage etc.
*
Coronary dilation, or coronary reflex
*
Dilation and curettage
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 s ...
, 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 dilation, a procedure for widening a narrowed esophagus
*
Pupillary dilation
Pupillary response is a physiological response that varies the size of the pupil between 1.5 mm and 8 mm, via the optic and oculomotor cranial nerve.
A constriction response (miosis), is the narrowing of the pupil, which may be caused by scler ...
(also called mydriasis), the widening of the pupil of the eye
*
Vasodilation
Vasodilation, also known as vasorelaxation, is the widening of blood vessels. It results from relaxation of smooth muscle cells within the vessel walls, in particular in the large veins, large arteries, and smaller arterioles. Blood vessel wa ...
, the widening of luminal diameter in blood vessels
Mathematics
*
Dilation (affine geometry)
In mathematics, a homothety (or homothecy, or homogeneous dilation) is a Transformation (mathematics), transformation of an affine space determined by a point called its ''center'' and a nonzero number called its ''ratio'', which sends point ...
, an affine transformation
*
Dilation (metric space) In mathematics, a dilation is a function f from a metric space M into itself that satisfies the identity
:d(f(x),f(y))=rd(x,y)
for all points x, y \in M, where d(x, y) is the distance from x to y and r is some positive real number.
In Euclidean s ...
, 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)
In affine geometry, uniform scaling (or isotropic scaling) is a linear transformation that enlarges (increases) or shrinks (diminishes) objects by a '' scale factor'' that is the same in all directions ( isotropically). The result of uniform s ...
, 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
*
Dilation (physics), size increase
*
Thermal expansion
Thermal expansion is the tendency of matter to increase in length, area, or volume, changing its size and density, in response to an increase in temperature (usually excluding phase transitions).
Substances usually contract with decreasing temp ...
of crystalline triglycerides is referred to as dilation
*
Scale invariance
In physics, mathematics and statistics, 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, and thus represent a universality.
The technical term ...
, 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 is the difference in elapsed time as measured by two clocks, either because of a relative velocity between them (special relativity), or a difference in gravitational potential between their locations (general relativity). When unsp ...
, 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
* ''Dialate,'' 1996 song by Linkin Park
See also
*
Dilution (disambiguation)
{{disambiguation