Definition of equator
1 : the great circle of the celestial sphere whose plane is perpendicular to the axis of the earth
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
4 : great circle
Recent Examples of equator from the Web
Sea surface temperatures around the equator are higher than average but not quite enough to meet the criteria.
According to NASA, they are determined based on the Earth's tilt on its axis and the sun's alignment over the equator.
A traditional Polynesian voyaging canoe on an around-the-world journey has reached a milestone by crossing the equator on its way back to Hawaii.
The cyclones are separate from Jupiter's trademark Great Red Spot, a raging hurricane-like storm south of the equator.
And a belt of ammonia may be rising around the planet’s equator.
Another might be only art made in colonial societies south of the equator.
The European Space Agency’s Mars Express orbiter has used its long-wavelength radar tools to probe a mysterious zone near the planet’s equator — and come away with scientists still stumped.
These example sentences are selected automatically from various online news sources to reflect current usage of the word 'equator'. Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.
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
Definition of equator for Students
: an imaginary circle around the earth everywhere equally distant from the north pole and the south pole
Seen and Heard
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