Definition of Equator

1. Noun. An imaginary line around the Earth forming the great circle that is equidistant from the north and south poles. "The equator is the boundary between the northern and southern hemispheres"

Generic synonyms: Great Circle
Derivative terms: Equatorial

2. Noun. A circle dividing a sphere or other surface into two usually equal and symmetrical parts.
Generic synonyms: Circle
Derivative terms: Equate, Equatorial

Definition of Equator

1. n. The imaginary great circle on the earth's surface, everywhere equally distant from the two poles, and dividing the earth's surface into two hemispheres.

Definition of Equator

1. Proper noun. The Earth’s equator. ¹

2. Noun. (context: often “the Equator”) An imaginary great circle around the Earth, equidistant from the two poles, and dividing earth's surface into the northern and southern hemisphere. ¹

3. Noun. A similar great circle on any sphere, especially on a celestial body, or on other reasonably symmetrical three-dimensional body. ¹

4. Noun. A short form of the celestial equator. ¹

¹ Source:

Definition of Equator

1. a great circle of spherical celestial bodies [n -S]

Medical Definition of Equator

1. 1. The imaginary great circle on the earth's surface, everywhere equally distant from the two poles, and dividing the earth's surface into two hemispheres. 2. The great circle of the celestial sphere, coincident with the plane of the earth's equator; so called because when the sun is in it, the days and nights are of equal length; hence called also the equinoctial, and on maps, globes, etc, the equinoctial line. 3. Equator of the sun or of a planet, the great circle whose plane passes through through the center of the body, and is perpendicular to its axis of revolution. Origin: L. Aequator one who equalizes: cf. F. Equateur equator. See Equate. Source: Websters Dictionary (01 Mar 1998)

Equator Pictures

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Lexicographical Neighbors of Equator

equation division
equations of motion
equator (current term)
equator bulbi oculi
equator lentis
equator of eyeball
equator of lens
equatorial cleavage
equatorial current
equatorial division
equatorial guinea
equatorial plane
equatorial plate
equatorial staphyloma

Literary usage of Equator

Below you will find example usage of this term as found in modern and/or classical literature:

1. The Encyclopaedia Britannica: A Dictionary of Arts, Sciences, and General by Thomas Spencer Baynes (1888)
"The angle formed by the planes of the ecliptic and equator, which ia measured by the aro of a circle of declination intercepted between -the equator and ..."

2. Encyclopaedia Britannica: A Standard Work of Reference in Art, Literature (1907)
"In Mercator's chart the equator in represented by a straight line, which u croas«! ... In the the equator, or indeed within 30° of latitud latitude of the ..."

3. Mathematical and Physical Papers: Collected from Different Scientific by Baron William Thomson Kelvin, Sir Joseph Larmor, James Prescott Joule (1882)
"Posterior Pole 0-023 colder than equator. than Anterior Pole ] 54 . ... Posterior Pole 0-052 warmer than equator» Posterior Pole 0-035 warmer than equator. ..."

4. The Gentleman's Magazine (1793)
"Sun «hich runs over the equator, and another Sun which runs over the Ecliptic j then he dr»ws perpendicular lines from ihe inclined degrees of the Eclip- ..."

5. The Sun by Amédée Guillemin (1875)
"In two points of the Earth's orbit, diametrically opposed to each other, our globe is in the plane of the Sun's equator, and these points are called nodes ..."

6. United States Supreme Court Reportsby Lawyers Co-operative Publishing Company, United States Supreme Court by Lawyers Co-operative Publishing Company, United States Supreme Court (1882)
"toa, from purchasing negroes on the coasts of Africa, enacting that voyages for that purpose may not be undertaken to the coasts north of the equator, ..."

7. An Introduction to Natural Philosophy: Designed as a Text Book, for the Use by Denison Olmsted (1832)
"If the magnetic meridian coincided with the geographical, the magnetic equator would coincide with the earth's equator ; but such is not the fact. ..."

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