equator

/ɪˈkweɪ.tə/noun

The imaginary circle around the middle of the Earth, halfway between the poles, separating the northern and southern halves of the planet.

Example sentences

“Countries near the equator have warm weather all year round.”
“We crossed the equator on our flight from Mexico to Peru.”

Always 'the equator', with the article. 'Equatorial' is the adjective, describing the hot, humid belt along it.

Related words

hemisphereOne half of the Earth, such as the northern, southern, eastern, or western half.longitudeThe distance of a place east or west of the prime meridian, measured as an angle.continentOne of the earth's largest unbroken landmasses, usually separated from the others by oceans or major geographical features, sometimes counted together with its shelves and nearby islands.latitudeA number in degrees that tells you how far north or south of the equator a place lies.overseasLocated in or connected with a foreign country, typically one across an ocean.globeThe world we live on; the planet Earth.