# ellipticity

## Definitions

• WordNet 3.6
• n ellipticity the property possessed by a round shape that is flattened at the poles "the oblateness of the planet"
• ***
Webster's Revised Unabridged Dictionary
• n Ellipticity Deviation of an ellipse or a spheroid from the form of a circle or a sphere; especially, in reference to the figure of the earth, the difference between the equatorial and polar semidiameters, divided by the equatorial; thus, the ellipticity of the earth is 1/29966.☞ Some writers use ellipticity as the ratio of the difference of the two semiaxes to the minor axis, instead of the major.
• ***
Century Dictionary and Cyclopedia
• n ellipticity The quality of being elliptic; the degree of divergence of an ellipse from the circle; specifically, in reference to the figure of the earth, the difference between the equatorial and polar semi-diameters divided by the equatorial: as, the ellipticity of the earth is . It may also without appreciable error be taken as twice the difference divided by the sum of the two axes.
• ***
Chambers's Twentieth Century Dictionary
• n Ellipticity deviation from the form of a circle or sphere: of the earth, the difference between the equatorial and polar diameters
• ***

## Etymology

Webster's Revised Unabridged Dictionary
Cf. F. ellipticité,
Chambers's Twentieth Century Dictionary
L.,—Gr. elleipsiselleipein, to fall short—en, in, leipein, to leave.

## Usage

### In literature:

It goes slower and slower with each return, and contracts the dimensions of its elliptical journey progressively.
"Chambers's Edinburgh Journal, No. 450" by Various
It was elliptical, touched with technical subtlety, although simple in appearance.
"The Shadow World" by Hamlin Garland
The vertical cast-iron headers have elliptical handholes with raised seats milled to a true plane.
"Steam, Its Generation and Use" by Babcock & Wilcox Co.
These are the ends of elliptic cylinders in connection with the vaulting.
"Bell's Cathedrals: The Cathedral Church of St. Paul" by Arthur Dimock
The comets thus follow a very elongated orbit, either elliptic, turning round the Sun, or parabolic, dashing out into space.
"Astronomy for Amateurs" by Camille Flammarion
A good target may be made of soft pine, circular or elliptical in shape.
"Illustrated Science for Boys and Girls" by Anonymous
It is my intention to-day to speak of similar problems which arise with reference to elliptical States.
"The Romance of Mathematics" by P. Hampson
The spores are elliptical to oval.
"Studies of American Fungi. Mushrooms, Edible, Poisonous, etc." by George Francis Atkinson
Circling round this globe four other spheres revolved in orbits, some almost circular, some elliptical, some parabolic.
"The Crack of Doom" by Robert Cromie
The elliptic form of the path would be quite unmistakable by the most casual observer.
"The Story of the Heavens" by Robert Stawell Ball
***

### In news:

Rome's Colosseum is the largest elliptical amphitheatre ever built in the Roman Empire.
Since I hadn't read the British Book Award winning novel, I initially found myself quite baffled by the surrealistic elliptical storyline.
Diamond Spas'€™ stainless steel elliptical soaking tub nestles in white river rocks.
Sputnik Elliptical Filament chandelier in?steel and filament bulbs by Restoration Hardware.
On the sideline was 76ers coach Doug Collins , getting his workout in on the elliptical.
At the gym recently, I found myself on the elliptical machine with two television options in front of me.
The full moon on May 5 reached perigee, which is the closest point to Earth in its elliptical pattern, according to NASA.
On the sideline was 76ers coach Doug Collins, getting his workout in on the elliptical.
Students exercise on the elliptical machines in the Activities and Recreation Center (ARC) at University of Illinois in Champaign, Ill. Dorene Internicola Reuters.
I'm now relying on a heart rate monitor to ensure I'm maintaining my cardio conditioning while on an elliptical machine and bike.
High-Energy Hits for the Elliptical.
At first I tried the stationary bike, then I moved on to an elliptical cross trainer, and finally, my albatross, running.
Astronomers have found an elliptical galaxy that may have been puffed up by the actions of one or more black holes in its core.
Unique to the design of these RoHS-compliant handles is that the tube and the handle legs have the same elliptical profile.
The elliptical piece is constructed from 100 percent post-industrial MDF board, with CFC-free foam and 40 percent recycled steel plinth.
***

### In science:

For which ellipticity is violated for a given p . 11) Such that ρpn ≍ ρ as n violates ellipticity.
Sharp Spectral Asymptotics for four-dimensional Schroedinger operator with a strong magnetic field. II
Certainly, this is true the case of early-type galaxies (elliptical and S0’s) as demonstrated by studies that examined the residuals from elliptical isophotes (Jedrzejewski 1987).
ARCHANGEL Galaxy Photometry System
We have the elliptic complex (K • , d) in section 1 and we use the Schauder estimates of the elliptic operators with respect to the complex (K • , d) with a constant CK .
Deformations of generalized complex and generalized Kahler structures
We prove in 3.3.1, 3.3.6 below that the set of isomorphism classes of ﬁnite dimensional simple spherical H-modules which are Jordan-H¨older composition factors of the homology of an elliptic aﬃne Springer ﬁber decomposes into families labelled by conjugacy classes of regular elliptic elements in W0 .
Finite dimensional representations of DAHA and affine Springers fibers : the spherical case
The integers which occur as orders of regular or elliptic regular elements are called regular or elliptic numbers respectively.
Finite dimensional representations of DAHA and affine Springers fibers : the spherical case
***