Definition of equator in English:

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Pronunciation: /ēˈkwādər/


1An imaginary line drawn around the earth equally distant from both poles, dividing the earth into northern and southern hemispheres and constituting the parallel of latitude 0°.
Example sentences
  • UV intensity falls as one moves from the equator toward Earth's poles, increasing latitude.
  • As of 1791, the meter was defined as one ten-millionth the distance from the North Pole to the equator along the line of longitude that passes through Paris.
  • This influx of fresh water causes the Gulf Stream, the ocean current that carries warm water from the equator into the northern hemisphere, to stop.
1.1A corresponding line on a planet or other body.
Example sentences
  • As it does so, Mars rotates, and so the cable heats up and wraps itself around the planet as it falls, eventually burning a groove all the way around the equator of the planet.
  • Boscovich was the first to give a procedure to compute a planet's orbit from 3 observations of its position and he also gave a procedure for determining the equator of a planet from 3 observations of a surface feature.
  • If the leading edge of the club starts on the ground at address, but it is contacting the ball around its equator, your body is probably rising somewhere between the start of your swing and impact.
1.2 Astronomy short for celestial equator.
Example sentences
  • The numbers that you see along the equator line represent celestial longitude, that is, hours of right ascension.


Late Middle English: from medieval Latin aequator, in the phrase circulus aequator diei et noctis 'circle equalizing day and night', from Latin aequare 'make equal' (see equate).

Words that rhyme with equator

cater, crater, creator, curator, data, debater, delator, dumbwaiter, fascinator, freighter, frustrater, gaiter, grater, gyrator, hater, later, legator, mater, negator, pater, peseta, plater, rotator, skater, slater, stater, tater, traitor, ultimata, understater, upstater, waiter

For editors and proofreaders

Syllabification: e·qua·tor

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