# ellipse

[ ih-lips ]

/ ɪˈlɪps /

### noun Geometry.

a plane curve such that the sums of the distances of each point in its periphery from two fixed points, the foci, are equal. It is a conic section formed by the intersection of a right circular cone by a plane that cuts the axis and the surface of the cone. Typical equation: (x2/a2) + (y2/b2) = 1. If a = b the ellipse is a circle.

## Nearby words

## Origin of ellipse

## Definition for ellipses (2 of 2)

## ellipsis

[ ih-lip-sis ]

/ ɪˈlɪp sɪs /

### noun, plural el·lip·ses [ih-lip-seez] /ɪˈlɪp siz/.

Grammar.

- the omission from a sentence or other construction of one or more words that would complete or clarify the construction, as the omission of who are, while I am, or while we are from I like to interview people sitting down.
- the omission of one or more items from a construction in order to avoid repeating the identical or equivalent items that are in a preceding or following construction, as the omission of been to Paris from the second clause of I've been to Paris, but they haven't.

Printing. a mark or marks as ——, …, or * * *, to indicate an omission or suppression of letters or words.

Dictionary.com Unabridged
Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

## Examples from the Web for ellipses

## British Dictionary definitions for ellipses (1 of 2)

## ellipse

/ (ɪˈlɪps) /

### noun

a closed conic section shaped like a flattened circle and formed by an inclined plane that does not cut the base of the cone. Standard equation x ²/ a ² + y ²/ b ² = 1, where 2 a and 2 b are the lengths of the major and minor axes. Area: π ab

## Word Origin for ellipse

C18: back formation from ellipsis

## British Dictionary definitions for ellipses (2 of 2)

## ellipsis

/ (ɪˈlɪpsɪs) /

### noun plural -ses (-siːz)

Also called: eclipsis omission of parts of a word or sentence

printing a sequence of three dots (…) indicating an omission in text

## Word Origin for ellipsis

C16: from Latin, from Greek elleipsis omission, from elleipein to leave out, from leipein to leave

Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

## Science definitions for ellipses

## ellipse

[ ĭ-lĭps′ ]

A closed, symmetric curve shaped like an oval, which can be formed by intersecting a cone with a plane that is not parallel or perpendicular to the cone's base. The sum of the distances of any point on an ellipse from two fixed points (called the foci) remains constant no matter where the point is on the curve.

The American Heritage® Science Dictionary
Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

## Culture definitions for ellipses (1 of 2)

## ellipsis

[ (i-lip-sis) ]

A punctuation mark (...) used most often within quotations to indicate that something has been left out. For example, if we leave out parts of the above definition, it can read: “A punctuation mark (...) used most often ... to indicate....”

## Culture definitions for ellipses (2 of 2)

## ellipse

[ (i-lips) ]

In geometry, a curve traced out by a point that is required to move so that the sum of its distances from two fixed points (called foci) remains constant. If the foci are identical with each other, the ellipse is a circle; if the two foci are distinct from each other, the ellipse looks like a squashed or elongated circle.

The New Dictionary of Cultural Literacy, Third Edition
Copyright © 2005 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.