transformation UK /ˌtɹæns.fə(ɹ)ˈmeɪ.ʃən/US /ˌtɹæns.fɔɹˈmeɪ.ʃən/ noun7 •The act of transforming or the state of being transformed. •A marked change in appearance or character, especially one for the better. •The alteration of a bacterial cell caused by the transfer of DNA from another, especially if pathogenic. •(South-Africa) The transition from the apartheid era to a multiracial democracy in South Africa. •The replacement of the variables in an algebraic expression by their values in terms of another set of variables; a mapping of one space onto another or onto itself; a function that changes the position or direction of the axes of a coordinate system. •A rule that systematically converts one syntactic form into another; a sentence derived by such a rule. •(no longer used) A woman's wig. formstransformations