equator -
a circle dividing a sphere or other surface into two usually equal and symmetrical parts
circle any circular or rotating mechanism; "the machine punched out metal circles"
equator -
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"
great circle a circular line on the surface of a sphere formed by intersecting it with a plane passing through the center
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Wiktionary
Substantiv
equator -
An imaginary great circle around the Earth, equidistant from the two poles, and dividing earth's surface into the northern and southern hemisphere.
equator -
A similar great circle on any sphere, especially on a celestial body, or on other reasonably symmetrical three-dimensional body.
equator An imaginary great circle around the earth, equidistant from the two poles, and dividing earth's surface into the northern and southern hemisphere.