[sim-pa-trik, -pey-]
adjective Biology, Ecology.
originating in or occupying the same geographical area.

1900–05; sym- + Greek pátr(ā) fatherland (patr-, stem of patḗr father + feminine noun suffix) + -ic Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
sympatric (sɪmˈpætrɪk)
Compare allopatric (of biological speciation or species) taking place or existing in the same or overlapping geographical areas
[C20: from syn- + -patric, from Greek patra native land, from patēr father]

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Science Dictionary
sympatric   (sĭm-pāt'rĭk)  Pronunciation Key 
Occupying the same or overlapping geographic areas without interbreeding. Although they share the same geographic range, sympatric populations of related organisms become isolated from each other reproductively. This can happen by the development of subpopulations that become dependent on distinct food sources or that evolve distinct seasonal mating behavior. Flowering plants frequently become reproductively isolated through the development of polyploid hybrids (hybrids with three or more sets of chromosomes) that cannot backcross with either parent. ◇ The development of new species as a result of the reproductive isolation of populations that share the same geographic range is called sympatric speciation. Compare allopatric.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
These so-called sympatric animals share food resources much of the year, but differ mostly during times of food scarcity.
Farther east, where sympatric with the common grackle, it takes more open sites than the grackle.
In areas where they are sympatric or overlap in range, the bears utilize different resources or are active at different times.
But sympatric speciation has drawn fierce criticism.
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