1. Between or within the tropics.
2. Of or relating to the tropics.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.


situated between the tropic of Cancer and the tropic of Capricorn, or relating to regions so situated
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014


(ˌɪn tərˈtrɒp ɪ kəl)

situated or occurring between the tropic of Cancer and the tropic of Capricorn; tropical.
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.
References in classic literature ?
At the Cape of Good Hope a very few European species, believed not to have been introduced by man, and on the mountains, some few representative European forms are found, which have not been discovered in the intertropical parts of Africa.
It should be observed that the northern species and forms found in the southern parts of the southern hemisphere, and on the mountain-ranges of the intertropical regions, are not arctic, but belong to the northern temperate zones.
Thus, as I believe, a considerable number of plants, a few terrestrial animals, and some marine productions, migrated during the Glacial period from the northern and southern temperate zones into the intertropical regions, and some even crossed the equator.
Something of the same kind must have occurred on the intertropical mountains: no doubt before the Glacial period they were stocked with endemic Alpine forms; but these have almost everywhere largely yielded to the more dominant forms, generated in the larger areas and more efficient workshops of the north.
I am far from supposing that all difficulties are removed on the view here given in regard to the range and affinities of the allied species which live in the northern and southern temperate zones and on the mountains of the intertropical regions.
The intertropical kingdoms of the Trade Winds are favourable to the ordinary life of a merchantman.
But on the 11th one of those inexplicable tempests peculiar to those intertropical regions was let loose in the atmosphere.
The contrast of palm trees, growing amidst the common branching kinds, never fails to give the scene an intertropical character.
Mindanao will experience cloudy skies with isolated rain showers and thunderstorms on Tuesday due to the Intertropical Convergence Zone, the Philippine Atmospheric, Geophysical, and Astronomical Services Administration (Pagasa) said.
This is brought about by the approaching low pressure area embedded in the intertropical convergence zone over the regions.
MANILA -- An intertropical convergence zone (ITCZ) is affecting eastern Visayas and Mindanao on Tuesday, bringing scattered rain showers and thunderstorms.
The intertropical convergence zone (ITCZ) is quite narrow, meaning that some of the rainiest spots in the tropics are located just a few hundred kilometers from the Earth's driest deserts.