a machine for performing calculations automatically

A device that computes, especially a programmable electronic machine that performs high-speed mathematical or logical operations or that assembles, stores, correlates, or otherwise processes information, an expert at calculation (or at operating calculating machines), a machine for performing calculations automatically

Plural form of calculation

The making of drawings in accordance with the rules of mathematics, as in engineering or architecture, Calculations, as of structural stress, from such drawings, The art of drawing, particularly of precise mechanical drawing, as of architectural and engineering plans