Meaning of EQUATOR in English

EQUATOR

/ ɪˈkweɪtə(r); NAmE / (usually the equator ) noun

[ sing. ] an imaginary line around the earth at an equal distance from the North and South Poles

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WORD ORIGIN

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, from aequus even, level, equal.

Oxford Advanced Learner's English Dictionary.      Оксфордский английский словарь для изучающик язык на продвинутом уровне.