from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. The course of developmental changes through which an organism passes from its inception as a fertilized zygote to the mature state in which another zygote may be produced.
  • n. A progression through a series of differing stages of development.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. the course of stages through which an organism passes from fertilized zygote until maturity, reproduction, and death
  • n. the useful life of a product or system; the developmental history of an individual or group in society

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • n. a series of stages through which an organism passes between recurrences of a primary stage
  • n. the course of developmental changes in an organism from fertilized zygote to maturity when another zygote can be produced


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