(1) A transfer of control from one software module to another, usually with the implication that control will be returned to the calling module. Contrast with: go~(2) A computer instruction that transfers control from one software module to another as in (1) and, often, specifies the parameters to be passed to and from the module.~(3) To transfer control from one software module to another as in (1) and, often, to pass parameters to the other module.