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 In the equatorial monsoon climate, June was the coolest month, with the most plentiful rain. Wired, 1 Sep. 2021 Either way, Europe and America could become disconnected while Asia’s equatorial Singapore hub would likely be less affected. Jamie Carter, Forbes, 31 Aug. 2021 Not only will crops further north and south be more susceptible to new infections than their equatorial counterparts, a wider variety of malignant microbes will also be more likely to pop up nearer the poles. Shi En Kim, Smithsonian Magazine, 5 Aug. 2021 Shoppers can expect to find plenty of produce from equatorial regions that are often hard to find in the United States grocery aisles, let alone in Indiana. Ko Lyn Cheang, The Indianapolis Star, 5 Aug. 2021 Peterson used a Meade 12-inch LX200GPS telescope to observe the event, which occurred near the southern edge of Jupiter's northern equatorial belt of clouds. Tariq Malik, Scientific American, 12 Sep. 2012 Keeping all these sensors, computers, inverters, voltage regulators, air conditioners, and generators running is a constant battle against equatorial entropy. Daniel Glick, Scientific American, 3 Apr. 2017 The aurorae went wild, appearing all over the globe, even at equatorial latitude. Ethan Siegel, Forbes, 8 June 2021 One current example is their displacement from their land in order to expand the development of an equatorial launchpad that promises to enhance international investment in Brazil as a destination for space launches. Davi Pereira Junior, Scientific American, 4 June 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

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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

27 Sep 2021

Cite this Entry

“Equatorial.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/equatorial. Accessed 15 Oct. 2021.

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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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