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metamorphism (n.)

"the process of changing form or structure," 1837, from metamorphic + -ism. Specifically, in geology, chemical change and rearrangement of the constituents of rock by which they assume new forms and combinations.

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Definitions of metamorphism from WordNet

metamorphism (n.)
change in the structure of rock by natural agencies such as pressure or heat or introduction of new chemical substances;
From wordnet.princeton.edu