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[ee-kwuh-tawr-ee-uh l, -tohr-, ek-wuh-] /ˌi kwəˈtɔr i əl, -ˈtoʊr-, ˌɛk wə-/
of, relating to, or near an equator, especially the equator of the earth.
of, like, or typical of the regions at the earth's equator:
equatorial temperatures.
a telescope mounting having two axes of motion, one parallel to the earth's axis and one at right angles to it.
a telescope with such a mounting.
Origin of equatorial
1655-65; equator + -ial
Related forms
equatorially, adverb
nonequatorial, adjective
nonequatorially, adverb
transequatorial, adjective
transequatorially, adverb
unequatorial, adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the Web for equatorial
Contemporary Examples
Historical Examples
  • The highlands in equatorial Africa exactly correspond to the picture drawn in the book.

    Freeland Theodor Hertzka
  • At that time the declination of the sun is 23½ north of the equatorial line.

    The Solar Magnet Sterner St. Paul Meek
  • In the equatorial region their height is often 10 miles or more.

    Meteorology Charles Fitzhugh Talman
  • We may therefore say that the equatorial circumference of the earth is 20,400 miles.

  • Numerous combinations of equatorial, trade and monsoon rainfalls are found, often creating great complexity.

  • This is a rough stone, not worked save in an equatorial groove.

  • Imagine a globe emitting heat 25,600 times fiercer than that of an equatorial sunshine at noonday, with the sun vertical.

    Aether and Gravitation William George Hooper
  • The ivory of their tusks constitutes the wealth of the equatorial Province.

    The River War Winston S. Churchill
British Dictionary definitions for equatorial


of, like, or existing at or near the equator
(astronautics) (of a telescope) mounted on the perpendicular axes, one of which is parallel to the earth's axis: an equatorial orbit
(astronomy) of or referring to the celestial equator: equatorial coordinates
an equatorial mounting for a telescope
Derived Forms
equatorially, adverb
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for equatorial

1660s, from equator + -al (1).

Online Etymology Dictionary, © 2010 Douglas Harper
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