[puh-nin-suh-luh, -nins-yuh-luh]
an area of land almost completely surrounded by water except for an isthmus connecting it with the mainland.
Spain and Portugal together; Iberian Peninsula; Iberia.
a district in SE Virginia between the York and James rivers: Civil War battles.

1530–40; < Latin paenīnsula, equivalent to paen- pen- + īnsula island

peninsular, adjective
peninsularism, peninsularity [puh-nin-suh-lar-i-tee, -nins-yuh-] , noun
transpeninsular, adjective

cape, peninsula, promontory. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
peninsula (pɪˈnɪnsjʊlə)
a narrow strip of land projecting into a sea or lake from the mainland
[C16: from Latin, literally: almost an island, from paenepene- + insula island]
usage  The noun peninsula is sometimes confused with the adjective peninsular: the Iberian peninsula (not peninsular)

the Peninsula short for the Iberian Peninsula

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

1538, from L. pæninsula, lit. "almost an island," from pæne "almost" + insula "island." Earlier translated as demie island.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Science Dictionary
peninsula   (pə-nĭn'syə-lə)  Pronunciation Key 
A piece of land that projects into a body of water and is connected with a larger landmass.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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American Heritage
Cultural Dictionary

peninsula definition

A body of land enclosed on three sides by water, jutting out from a larger body of land.

The American Heritage® New Dictionary of Cultural Literacy, Third Edition
Copyright © 2005 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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Example sentences
The stadium, which will sit on an artificial peninsula in the gulf, is designed
  to evoke its marine setting.
Foreigners need defence-ministry permission to visit the peninsula.
It sits on a sandy peninsula that has been spared from the tacky development
  that has overrun much of Cancún.
It's the same story up and down the peninsula.
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