Толковый словарь английского языка - transformation

noun Date: 15th century an act, process, or instance of transforming or being transformed, false hair worn especially by a woman to replace or supplement natural hair, 3. a. the operation of changing (as by rotation or mapping) one configuration or expression into another in accordance with a mathematical rule, the formula that effects a ~, function 5a, an operation that converts (as by insertion, deletion, or permutation) one grammatical string (as a sentence) into another, genetic modification of a bacterium by incorporation of free DNA from another bacterial cell