equatorial

[ee-kwuh-tawr-ee-uhl, -tohr-, ek-wuh-]
adjective
1.
of, pertaining to, or near an equator, especially the equator of the earth.
2.
of, like, or typical of the regions at the earth's equator: equatorial temperatures.
noun
3.
a telescope mounting having two axes of motion, one parallel to the earth's axis and one at right angles to it.
4.
a telescope with such a mounting.

Origin:
1655–65; equator + -ial

equatorially, adverb
nonequatorial, adjective
nonequatorially, adverb
transequatorial, adjective
transequatorially, adverb
unequatorial, adjective
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
equatorial (ˌɛkwəˈtɔːrɪəl)
 
adj
1.  of, like, or existing at or near the equator
2.  astronautics (of a telescope) mounted on the perpendicular axes, one of which is parallel to the earth's axis: an equatorial orbit
3.  astronomy of or referring to the celestial equator: equatorial coordinates
 
n
4.  an equatorial mounting for a telescope
 
equa'torially
 
adv

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Etymonline
Word Origin & History

equatorial
1713, from equator + -al.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
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.
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