[ter-i-tawr-ee-al-i-tee, -tohr-]
territorial quality, condition, or status.
the behavior of an animal in defining and defending its territory.
attachment to or protection of a territory or domain.

1890–95; territorial + -ity

nonterritoriality, noun
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World English Dictionary
territoriality (ˌtɛrɪˌtɔːrɪˈælɪtɪ)
1.  the state or rank of being a territory
2.  the behaviour shown by an animal when establishing and defending its territory

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Medical Dictionary

territoriality ter·ri·to·ri·al·i·ty (těr'ĭ-tôr'ē-āl'ĭ-tē)

  1. A behavior pattern in animals consisting of the occupation and defense of a territory.

  2. A similar behavior pattern in humans consisting of the tendency to defend a particular domain or sphere of influence or interest.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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American Heritage
Science Dictionary
territoriality   (těr'ĭ-tôr'ē-āl'ĭ-tē)  Pronunciation Key 
A behavior pattern in animals consisting of the occupation and defense of a territory.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
The latter must be treated with extreme caution, as bull sharks are noted for their aggression and territoriality.
No matter what the species, it probably engages in some form of territoriality.
And she managed to do it without the self-righteous territoriality that is the occupational vice of human-rights experts.
Among the research areas explored are small group ecology, territoriality, and the related concept of privacy.
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