in·i·ti·a·tion

[ih-nish-ee-ey-shuhn]
noun
1.
formal admission or acceptance into an organization or club, adult status in one's community or society, etc.
2.
the ceremonies or rites of admission. Compare rite of passage.
3.
the act of initiating.
4.
the fact of being initiated.

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

pre·in·i·ti·a·tion, noun
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Based on the Random House Dictionary, © Random House, Inc. 2013.
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Initiation is always a great word to know.
So is lollapalooza. Does it mean:
an extraordinary or unusual thing, person, or event; an exceptional example or instance.
a children's mummer's parade, as on the Fourth of July, with prizes for the best costumes.
Collins
World English Dictionary
initiation (ɪˌnɪʃɪˈeɪʃən) [Click for IPA pronunciation guide]
 
n
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
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Etymonline
Word Origin & History

initiation
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)
n.

  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
Regardless of who were to prevail the risks are too great to justify the
  initiation of such an adventure.
It was used in boys' initiation rites to dramatize the notions of fertility and
  childbirth.
These variables influence spike initiation and weight adjustment.
Country club initiation fees tend to be one of those closely held secrets that
  rarely see the public light.
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