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

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 La Nina and its opposite counterpart El Nino refer to water temperatures in the equatorial Pacific Ocean. oregonlive, 3 Jan. 2022 Arthropleura animals crawled around Earth's equatorial region for around 45 million years, before going extinct during the Permian period. David Bressan, Forbes, 21 Dec. 2021 That sounds more like Antarctica than the other more equatorial destinations on this list. Valerie Stimac, Forbes, 29 Dec. 2021 The new house will allow the zoo to import butterflies from rainforests in South America, Southeast Asia and equatorial Africa any time of year rather than seasonally as is custom. Megan Rodriguez, San Antonio Express-News, 20 Oct. 2021 La Nina occurs when equatorial trade winds become stronger, changing ocean surface currents and drawing up cooler deep water. Rod Mcguirk, Star Tribune, 7 Jan. 2021 Meteorologists attribute the latest batch of record-shattering weather extremes to a stuck jet stream and the effects of a La Nina weather pattern from cooling waters in the equatorial Pacific. Compiled Democrat-gazette Staff From Wire Reports, Arkansas Online, 5 Dec. 2021 And then slowly over time, on the timescale of months, things sort of migrate in general from equatorial regions up toward the poles, and then particles fall out near the poles. Matt Simon, Wired, 30 Nov. 2021 Dragonfly drone, which will launch in 2025 and reach Titan’s equatorial regions in 2034. Jamie Carter, Forbes, 9 Nov. 2021

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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Dictionary Entries Near equatorial

equator coordinate


equatorial current

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Statistics for equatorial

Last Updated

18 Jan 2022

Cite this Entry

“Equatorial.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/equatorial. Accessed 23 Jan. 2022.

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More Definitions for equatorial



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

More from Merriam-Webster on equatorial

Nglish: Translation of equatorial for Spanish Speakers

Britannica English: Translation of equatorial for Arabic Speakers


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