equator

equator
noun Etymology: Middle English, from Medieval Latin aequator, literally, equalizer, from Latin aequare Date: 14th century 1. the great circle of the celestial sphere whose plane is perpendicular to the axis of the earth 2. a great circle of the earth or a celestial body that is everywhere equally distant from the two poles and divides the surface into the northern and southern hemispheres 3. a. a circle or circular band dividing the surface of a body into two usually equal and symmetrical parts b. equatorial plane <
the equator of a dividing cell
>
4. great circle

New Collegiate Dictionary. 2001.

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