# eccentricity

Also found in: Dictionary, Thesaurus, Medical, Legal, Acronyms, Wikipedia.

## eccentricity,

in astronomy: see orbitorbit,
in astronomy, path in space described by a body revolving about a second body where the motion of the orbiting bodies is dominated by their mutual gravitational attraction.
.
Eccentricity

## eccentricity

Symbol: e . A measure of the extent to which an elliptical orbit departs from circularity. It is given by the ratio c /2a where c is the distance between the focal points of the ellipse and 2a is the length of the major axis. For a circular orbit e = 0. The planets and most of their satellites have an eccentricity range of 0–0.25 (see table). Many comets and some of the asteroids and planetary satellites have very eccentric orbits. The eccentricity of an orbit varies over a long period due to changing gravitational effects: that of the Earth's orbit varies between about 0.005 to 0.06 in a period of about 100 000 years. See also conic sections.

## Eccentricity

in a conic section, a number equal to the ratio of a point’s distance from the focus to its distance from a directrix. The eccentricity characterizes the shape of a conic section. For example, two conic sections that have the same eccentricity are similar. The eccentricity of an ellipse is less than unity, that of a hyperbola is greater than unity, and that of a parabola is equal to unity. For the ellipse and hyperbola, the eccentricity may be defined as the ratio of the distances between the foci to the longer or real axis.

## eccentricity

[‚ek·sən′tris·əd·ē]
(mathematics)
The ratio of the distance of a point on a conic from the focus to the distance from the directrix.
(mechanics)
The distance of the geometric center of a revolving body from the axis of rotation.

## Eccentricity

weird family, presented in grotesque domesticity. [TV: Terrace, I, 29]
Boynton, Nanny
travels with set of Encyclopaedia Britannica to settle disputes. [Am. Lit.: “Percy” in Stories, 634–644]
Dick, Mr.
odd but harmless old gentleman. [Br. Lit.: David Copperfield]
Doolittle, Doctor
veterinarian who talks to animals. [Children’s Lit.: Dr. Doolittle]
Flite, Miss
“ancient” ward in Chancery. [Br. Lit.: Bleak House]
Great-Aunt Dymphna
outlandish dresser who pointedly doesn’t eat meat. [Children’s Lit.: The Growing Summer, Fisher 124–127]
Havisham, Miss
jilted bride turns into witchlike old woman. [Br. Lit.: Great Expectations]
Longstocking, Pippi
outrageous, rebellious, imaginative child. [Children’s Lit.: Pippi Longstocking]
individualist; only girl “out of line.” [Children’s Lit.: Madeline, Fisher, 196]
delightfully pixilated old woman manages to exploit the Parisian exploiters. [Fr. Lit.: The Madwoman of Chaillot, Benét, 618]
Pickwick, Mr. (Samuel)
jolly “conformist” who understands anything but the obvious. [Br. Lit.: Pickwick Papers]
Poppins, Mary
English nanny who practises levitation, flies up chimneys, etc. [Children’s Lit.: Mary Poppins, Fisher, 218]
Salus, St. Simeon
behaved queerly to share outcasts’ contempt. [Christian Hagiog.: Attwater, 311]

## eccentricity

1. deviation from a circular path or orbit
2. a measure of the noncircularity of an elliptical orbit, the distance between the foci divided by the length of the major axis
3. Geometry a number that expresses the shape of a conic section: the ratio of the distance of a point on the curve from a fixed point (the focus) to the distance of the point from a fixed line (the directrix)
4. the degree of displacement of the geometric centre of a rotating part from the true centre, esp of the axis of rotation of a wheel or shaft
References in periodicals archive ?
For accuracy improvement of the calibration, some means are taken to eliminate deviations from roundness of the standard measure although there are no efforts made to eliminate an influence of the eccentricity of roundness standard to the axis of spindle rotation [6].
Draw for Friday's pounds 750 final 1 Bigwood Rocket, 2 Bonville Podge, 3 Eccentricity, 4 Black Ice Boss, 5 Lethal Rapunzal (w), 6 Yourgorgeoustoo (w).
The effect of eccentricity [epsilon] on the kinematic and thermal field is studied for Ra = [5.
Because of eccentricity the neck at action of axial force bends, the bending displacement is enlarged by stick 16 and transmitted to transducer 17.
Its present installation is fabulous precisely in its out-of-the-way eccentricity (eccentricity in the double sense of being away from the urban center and outside the main-stream).
calender roll eccentricity or run out at ambient temperature;
Balancing eccentricity and nightmare, the excellent cast played clockwork crazies who used cutlery, plates, towels, and their own bodies in strangely humorous, controlled rituals of obsessive-compulsive hysteria.
So far, Mathieu's group has identified a total of seven close binaries among both classes of stars and determined the period and shape, or eccentricity, of their orbits.
Nasdaq:ADSK) the world's leading design software and digital content company, today announced that the Smart Measurements Group, part of Australia's Commonwealth Scientific and Industrial Research Organisation (CSIRO), has stated a 50-percent reduction in the design time of an Eccentricity Measuring Device by using Autodesk Inventor(R) 3D design software.
Secondly, a limited parametric study in which the effect of rotor dimensions, as well as relative eccentricity on the stability of a rotating machine have also been examined.
The asymmetry in plan that is derived from this eccentricity, is further exaggerated with the main accommodation being pushed tight against the opposing edge, allowing the external space to extend as an L-shaped garden around the house.

Site: Follow: Share:
Open / Close