equator

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noun equa·tor \i-ˈkwā-tər, ˈē-ˌ\

Definition of equator

  1. 1 :  the great circle of the celestial sphere whose plane is perpendicular to the axis of the earth

  2. 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. 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. 4 :  great circle

Origin and Etymology of equator

Middle English, from Medieval Latin aequator, literally, equalizer, from Latin aequare


First Known Use: 14th century



EQUATOR Defined for Kids

equator

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noun equa·tor \i-ˈkwā-tər\

Definition of equator for Students

  1. :  an imaginary circle around the earth everywhere equally distant from the north pole and the south pole


Medical Dictionary

equator

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noun equa·tor \i-ˈkwāt-ər, ˈē-ˌ\

Medical Definition of equator

  1. 1:  a circle or circular band dividing the surface of a body into two usually equal and symmetrical parts especially at the place of greatest width <the equator of the lens of the eye>

  2. 2:  equatorial plane



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