Definition of "equator" in English

noun

1. (geography, often “the Equator”) An imaginary great circle around Earth, equidistant from the two poles, and dividing earth's surface into the northern and southern hemispheres.

2. (astronomy) A similar great circle on any sphere, especially on a celestial body, or on another reasonably symmetrical three-dimensional body.

3. The midline of any generally spherical object, such as a fruit or vegetable, that has identifiable poles.

   • Slice the onion through the equator.

4. The celestial equator.