formal admission or acceptance into an organization or club, adult status in one's community or society, etc.
the ceremonies or rites of admission. Compare rite of passage.
the act of initiating.
the fact of being initiated.

1575–85; < Latin initiātiōn- (stem of initiātiō). See initiate, -ion

preinitiation, noun Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
initiation (ɪˌnɪʃɪˈeɪʃən)
1.  the act of initiating or the condition of being initiated
2.  the often secret ceremony initiating new members into an organization

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

1580s, from L. initiationem (nom. initiatio) "participation in secret rites," from initiatus, pp. of initiare "originate, initiate," from initium (see initial).
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

initiation in·i·ti·a·tion (ĭ-nĭsh'ē-ā'shən)

  1. The act or an instance of initiating.

  2. The condition of being initiated.

  3. The first stage of tumor induction by a carcinogen in which cells are altered so that they are likely to form a tumor upon subsequent exposure to a promoting agent.

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
Country club initiation fees tend to be one of those closely held secrets that
  rarely see the public light.
Think only of the initiation into fraternity and sorority houses.
The driver's license is the initiation rite into adulthood.
These variables influence spike initiation and weight adjustment.
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