- the great circle on a sphere or heavenly body whose plane is perpendicular to the axis, equidistant everywhere from the two poles of the sphere or heavenly body.
- the great circle of the earth that is equidistant from the North Pole and South Pole.
- a circle separating a surface into two congruent parts.
- celestial equator.
Origin of equator
Examples from the Web for equator
Yasuni Natonal Park, where the equator meets the Andes, is famed for its fabulous variety of plants and animals.The Rio+20 Conference Went From Good Intentions to the To-Do List From Hell
June 23, 2012
An orbit near the equator was important for a variety of reasons.5 Cool Facts About NASA’s NuSTAR X-Ray Telescope
June 13, 2012
Those storms kicked up in the collision zone around the equator spin westward off the coast of Cape Verde.Sudan Drought Breeds Violence
July 3, 2011
And yet the trees are cultivated in every country within 15 degrees of the Equator, so a virtual cocoa belt encircles the globe.Four Chocolate Questions Answered
September 29, 2009
Aunt Jane approached a degree nearer the equator, and said, gently, "I fear I do."Malbone
Thomas Wentworth Higginson
I may almost say their temperature would be the same at the Equator as the Pole.The Field of Ice
And he tells you that the earth south of the Equator makes the inferior man.Slavery Ordained of God
Rev. Fred A. Ross, D.D.
There is no distinction between the equator and the ecliptic.The Republic
If it did, the equator would be frozen in twenty-four hours!
Word Origin and History for equator
late 14c., from Medieval Latin aequator diei et noctis "equalizer of day and night" (when the sun is on the celestial equator, twice annually, day and night are of equal length), agent noun from Latin aequare "make equal" (see equate). Sense of "celestial equator" is earliest, extension to "terrestrial line midway between the poles" first recorded in English 1610s.
- An imaginary line forming a great circle around the Earth's surface, equidistant from the poles and in a plane perpendicular to the Earth's axis of rotation. It divides the Earth into the Northern and Southern hemispheres and is the basis from which latitude is measured.
- A similar circle on the surface of any celestial body.
- The celestial equator.