transformation

Concise Oxford English Dictionary © 2008 Oxford University Press:
transformation/transfəˈmeɪʃn/

▶noun

• 1 a marked change in nature, form, or appearance.

• 2 Mathematics & Logic a process by which a figure, expression, or function is converted into another one of similar value.

• 3 Linguistics a process by which an element in the underlying logical deep structure of a sentence is converted to an element in the surface structure.

• 4 Biology the transfer of genetic information between different species of bacteria, especially by a plasmid.

– derivatives
transformational adjective,
transformationally adverb.