Synonyms: equator
Definition: an imaginary line around the Earth forming the great circle that is equidistant from the north and south poles
Usage: the equator is the boundary between the northern and southern hemispheres
Similar words: great circle
Definition: a circular line on the surface of a sphere formed by intersecting it with a plane passing through the center
Synonyms: equator
Definition: a circle dividing a sphere or other surface into two usually equal and symmetrical parts
Similar words: circle
Definition: ellipse in which the two axes are of equal length; a plane curve generated by one point moving at a constant distance from a fixed point
Usage: he calculated the circumference of the circle