dispersal

[dih-spur-suhl]
noun
dispersion ( def 1 ).

Origin:
1815–25; disperse + -al2

nondispersal, noun
redispersal, noun
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World English Dictionary
dispersal (dɪˈspɜːsəl)
 
n
1.  the act of dispersing or the condition of being dispersed
2.  the spread of animals, plants, or seeds to new areas

Collins English Dictionary - Complete & Unabridged 10th Edition
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Etymonline
Word Origin & History

dispersal
1821, from disperse + -al (2).
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
Dispersal: some movement to lower elevation in northern part of range.
Researchers had thought this species might be a fluke-a single, short-lived
  dispersal of one type of tetrapod.
Dispersal: this species is not migratory, but some individuals can disperse
  long distances.
Dispersal: generally resident, but large irruptions casually occur in fall and
  winter.
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