To change markedly the appearance or form of, Mathematics To subject to a transformation, To undergo a transformation, transitive verb_ To change the form of; to change in shape or appearance; to metamorphose, To change into another substance; to transmute, to change greatly the appearance or form of, verb_ subject to a mathematical transformation, change or alter in form, appearance, or nature, change (a bacterial cell) into a genetically distinct cell by the introduction of DNA from another cell of the same or closely related species, noun_ The result, especially a mathematical quantity or linguistic construction, of a transformation