[ 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

First recorded in 1655–65; equator + -ial

Related forms

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for equatorial

British Dictionary definitions for equatorial


/ (ˌɛkwəˈtɔːrɪəl) /


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 axisan equatorial orbit
astronomy of or referring to the celestial equatorequatorial 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