epigenesis

/EH0 P AH0 JH EH1 N AH0 S AH0 S/
noun
  1. 1

    The theory that an organism develops by differentiation from an unstructured egg rather than by simple enlarging of something preformed.

  2. 2

    Changes in the mineral content of rock after its formation.

Source: https://en.wiktionary.org/wiki/epigenesis