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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