(mathematical analysis) An operation (often an integration) that converts one function into another.

(by extension) A function so produced.

(geology, seismology) A transform fault.

(transitive) To change greatly the appearance or form of.

(transitive) To change the nature, condition or function of; to change in nature, disposition, heart, character, etc.; to convert.

(transitive, mathematics) To subject to a transformation; to change into another form without altering the value.

(transitive, electricity) To subject to the action of a transformer.

(transitive, genetics) To subject (a cell) to transformation.

(intransitive) To undergo a transformation; to change in appearance or character.