1. any change in appearance, form, function, or structure. See also metamorphosis.

2. the conversion of data to a different form through a rule-based and usually mathematical process, such as changing Fahrenheit to Celsius. In statistics, a raw score is often transformed into a standardized score for purposes of comparison. See also linear transformation; nonlinear transformation.

3. in psychoanalytic theory, the process by which unconscious wishes or impulses are disguised in order to gain admittance to consciousness. —transform vb. —transformational adj.