trans·form / transˈfôrm/ • v. [tr.] make a thorough or dramatic change in the form, appearance, or character of: lasers have transformed cardiac surgery he wanted to transform himself into a successful businessman. ∎  [intr.] undergo such a change: an automobile that transformed into a boat. ∎  change the voltage of (an electric current). ∎  Math. change (a mathematical entity) by transformation.• n. / ˈtransfôrm/ Math. & Linguistics the product of a transformation. ∎  a rule for making a transformation.DERIVATIVES: trans·form·a·ble adj.trans·form·a·tive / -mətiv/ adj.

transform XIV. — (O)F. transformer or L. transformāre; see TRANS-, FORM.
So transformation XV. — (O)F. or late L.