- An imaginary great circle around the earth, equidistant from the two poles, and dividing earth's surface into the northern and southern hemisphere.
- A similar great circle on any sphere, especially on a celestial body, or on other reasonably symmetrical three-dimensional body.
- A short form of the celestial equator.
Etymology: Late Latin (circulus) aequator (diei et noctis), aequatoris
- Dutch: evenaar , equator
- Dutch, equator
- French: équateur
- German: í„quator
- Italian: equatore
- Spanish: ecuador
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