equa·​to·​ri·​al | \ ˌē-kwə-ˈtȯr-ē-əl How to pronounce equatorial (audio) , ˌe-kwə- \

Definition of equatorial

1a : of, relating to, or located at the equator or an equator also : being in the plane of the equator a satellite in equatorial orbit
b : of, originating in, or suggesting the region around the geographic equator
2a : being or having a support that includes two axles at right angles to each other with one parallel to the earth's axis of rotation an equatorial telescope mount
b : extending in a direction essentially in the plane of a cyclic structure (as of cyclohexane) equatorial hydrogens — compare axial

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Synonyms & Antonyms for equatorial



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Examples of equatorial in a Sentence

a lush equatorial rain forest that is threatened by rampant development
Recent Examples on the Web Lying there looking up at the stars of the inky equatorial sky, I was filled with respect for all that surrounded me. David Jefferys, Condé Nast Traveler, "Exploring the Galapagos Islands on the First Ship Designed for the Region," 19 Nov. 2019 In sunny and equatorial places, only about 1% of the population experiences what’s called seasonal affective disorder, a type of depression. Morgan Krakow, Anchorage Daily News, "Feeling SAD? Seasonal affective disorder rears its yearly head in Alaska.," 21 Dec. 2019 Gumelemi Bluff Harbour Estate is lucky to be swathed in verdant palms and ferns, but if your beach house isn’t located in an equatorial climate, vibrant potted plants and evergreens will also do the trick. Jennifer Fernandez, ELLE Decor, "5 Ways to Transform Any Beach House into a Serene Tropical Oasis," 27 Nov. 2019 The x-rays, also emitted from the aurora at the south pole, are thought to be generated when magnetic fields funnel particles from the equatorial ring around Jupiter. Belinda J. Wilkes, Scientific American, "The Universe through X-ray Eyes," 26 Nov. 2019 Today, most of the world’s coffee beans are grown on mountains in equatorial countries like Ethiopia, Costa Rica and Colombia. San Diego Union-Tribune, "$35 for a cup of coffee? But it’s locally grown by Grammy winner Jason Mraz," 5 Oct. 2019 Third, Alcantara is just 2.3 degrees south of the equator, a near-perfect placement for slinging satellites into equatorial or polar orbits. Joe Pappalardo, Popular Mechanics, "Can the U.S. Save Alcantara, Brazil’s Cursed Spaceport?," 20 Mar. 2019 That makes the northern and southern parts of the equatorial region appealing. Ashley Strickland, CNN, "Water found an inch beneath the Martian surface could help future astronauts," 11 Dec. 2019 El Niño, a weather pattern that might have influenced this year's hurricane season, has dissipated completely and transitioned into a neutral stage, where sea surface temperatures are normal in the equatorial Pacific, NOAA declared Thursday. Jordan Evans, CNN, "Expect a busier-than-normal hurricane season, NOAA says," 8 Aug. 2019

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'equatorial.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

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First Known Use of equatorial

1664, in the meaning defined at sense 1a

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Time Traveler for equatorial

Time Traveler

The first known use of equatorial was in 1664

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Statistics for equatorial

Last Updated

12 Jan 2020

Cite this Entry

“Equatorial.” The Merriam-Webster.com Dictionary, Merriam-Webster Inc., https://www.merriam-webster.com/dictionary/equatorial. Accessed 21 January 2020.

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More Definitions for equatorial


How to pronounce equatorial (audio)

English Language Learners Definition of equatorial

: of or relating to the equator : located at or near the equator


equa·​to·​ri·​al | \ ˌē-kwə-ˈtȯr-ē-əl How to pronounce equatorial (audio) , ˌe-kwə- \

Kids Definition of equatorial

: relating to or lying near the equator an equatorial climate


equa·​to·​ri·​al | \ ˌē-kwə-ˈtōr-ē-əl How to pronounce equatorial (audio) , ˌek-wə- How to pronounce equatorial (audio) , -ˈtȯr- \

Medical Definition of equatorial

1 : of, located at, or relating to an equator equatorial diameter
2 : extending in a direction essentially in the plane of a cyclic structure (as of cyclohexane) equatorial hydrogen atoms — compare axial sense 2b

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Comments on equatorial

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