[pree-dis-puh-zish-uhn, pree-dis-]
the fact or condition of being predisposed: a predisposition to think optimistically.
Medicine/Medical. tendency to a condition or quality, usually based on the combined effects of genetic and environmental factors.

1615–25; pre- + disposition

predispositional, adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
predisposition (ˌpriːdɪspəˈzɪʃən)
1.  the condition of being predisposed
2.  med See diathesis susceptibility to a specific disease

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin & History

1622, from pre- + dispose (q.v.). The verb predispose is recorded from 1646.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

predisposition pre·dis·po·si·tion (prē'dĭs-pə-zĭsh'ən)

  1. The state of being predisposed.

  2. A condition of special susceptibility, as to a disease.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Example sentences
One thing not mentioned: the genetic predisposition toward addiction about
  which our kids need to be educated.
Hence, our ancestors were selected with a predisposition to favor sugary things.
Price wanted to describe mathematically how a genetic predisposition to
  altruism could evolve.
But the predisposition requires social experience to be activated.
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