- 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"
--1 is a kind of great circle
- equator - a circle dividing a sphere or other surface into two usually equal and symmetrical parts
--2 is a kind of circle
Derived form: verb equate3 - equator - a circle dividing a sphere or other surface into two usually equal and symmetrical parts