Eccentricity
A quantity defined for a Conic Section which can be given in terms of Semimajor andSemiminor Axes for an Ellipse. For an Ellipse with Semimajor Axis 
andSemiminor Axis 
,
The eccentricity can be interpreted as the fraction of the distance to the semimajor axis at which the Focus lies,
where
is the distance from the center of the Conic Section to the Focus.The table below gives the type of Conic Section corresponding to various ranges of eccentricity 
. | Curve |
 | Circle |
 | Ellipse |
 | Parabola |
 | Hyperbola |
- Anticomplementary Triangle
- Antiderivative
- Antidifferentiation
- Antigonal Points
- Antihomography
- Antihomologous Points
- Antilaplacian
- Antilinear Operator
- Antilogarithm
- Antimagic Graph
- Antimagic Square
- Antimorph
- Antimorphic Number
- Antinomy
- Antiparallel
- Antipedal Triangle
- Antipersistent Process
- Antipodal Map
- Antipodal Points
- Antipode
- Antiprism
- Antiquity
- Antisnowflake
- Antisquare Number
- Antisymmetric