transformation

1 :  an act, process, or instance of transforming or being transformed

2 :  false hair worn especially by a woman to replace or supplement natural hair

3a (1) :  the operation of changing (as by rotation or mapping) one configuration or expression into another in accordance with a mathematical rule; especially :  a change of variables or coordinates in which a function of new variables or coordinates is substituted for each original variable or coordinate (2) :  the formula that effects a transformationb :  function 5ac :  an operation that converts (as by insertion, deletion, or permutation) one grammatical string (such as a sentence) into another; also :  a formal statement of such an operation

4 :  genetic modification of a bacterium by incorporation of free DNA from another bacterial cell; also :  genetic modification of a cell by the uptake and incorporation of exogenous DNA