Performing some predefined sequence of operations on an input to produce an output or change of internal state activITy specifically involving the computer' s CPU. The term is often qualified: "data processing" treats digITal data, "signal processing" treats analog data (possibly in digITal form), "word processing" takes in typed human language input and produces digITal documents, {image processing} transforms digITal {images}. (2003-10-23)