What is the meaning of Metamorphosis?

A transformation, such as one performed by magic.

A noticeable change in character, appearance, function, or condition.

A change in the form and often habits of an animal after the embryonic stage during normal development (e.g. the transformation of a caterpillar into a butterfly or a tadpole into a frog).

A change, usually degenerative, in the structure of a specific body tissue.

Source: wiktionary.org