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"
a circle dividing a sphere or other surface into two usually equal and symmetrical parts
"The storm system formed directly along the equator, splitting the ocean's heat distribution perfectly in half."
An imaginary great circle around the Earth, equidistant from the two poles, and dividing earth's surface into the northern and southern hemisphere.
"As the sun reached its highest point directly over the equator during the summer solstice, days in the Northern Hemisphere began to shorten while those in the south grew longer."
The Earth’s equator.
"The plane flew directly over the equator, marking halfway through its journey around the globe."