—v.
1 a tr. make a thorough or dramatic change in the form, outward appearance, character, etc., of. b intr. (often foll. by into, to) undergo such a change.
2 tr. Electr. change the voltage etc. of (a current).
3 tr. Math. change (a mathematical entity) by transformation.
—n. Math. & Linguistics the product of a transformation.
Derivatives:
transformable adj. transformative adj.
Etymology: ME f. OF transformer or L transformare (as TRANS-, FORM)
Useful english dictionary. 2012.