| n. | 1. | (Geog.) The imaginary great circle on the earth's surface, everywhere equally distant from the two poles, and dividing the earth's surface into two hemispheres. | ||||||
| 2. | (Astron.) The great circle of the celestial sphere, coincident with the plane of the earth's equator; - so called because when the sun is in it, the days and nights are of equal length; hence called also the
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| Noun | 1. | 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" |
| 2. | equator - a circle dividing a sphere or other surface into two usually equal and symmetrical parts |