1) Transformation or change over
2) Something that is characterised by a change in any way
Metamorphosis can be learnt easily by associating the word to any movie with a story line where the actress was earlier an ugly duckling, but one day she is shown to be really beautiful. This transformation from ugly duckling to a beautiful girl can also be called metamorphosis.
1) Metamorphosis from a small business to a business spanning over various counties has taken a lot of hard work.
2) Life is all about various metamorphoses at various stages until the last day. (Plural)