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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
  • Tropical storms need warm water, moist air, and converging equatorial winds to become hurricanes.
  • The path he took was new to him, and in the heavy equatorial heat, his dysentery returned.
  • It tends to be thickest over equatorial regions and thinnest over the poles.
  • Beneath the diverging air, surface pressure drops and an equatorial trough develops.
  • The exposed rock reflects the heat of the equatorial sun and drives away rain.
  • equatorial glaciers will melt and river-flows fall, even as demand for water rises.
  • Ask them if they think there are any seasons at all in equatorial regions.
  • Otherwise, patrons rely on a battery of oscillating fans to stir the equatorial air as they hunch over their food.
  • As the equatorial air warms up, it expands and rises.
  • They dwell in equatorial rainforests and are characterized by their short mean stature.
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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