the limit, as the norm of the partition of a given surface into sections of area approaches zero, of the sum of the product of the areas times the value of a given function of three variables at some point on each section.
noun, Meteorology. 1. the thin layer of air adjacent to the earth’s surface, usually considered to be less than 300 feet (91 meters) high.
noun 1. the system, especially a government postal system, of sending mail by truck, train, or boat, as opposed to airmail. 2. mail sent by this system. surface mail noun 1. mail transported by land or sea Compare airmail
noun, Audio. 1. extraneous noise caused by physical wear or a physical flaw on a phonograph record or in a pickup system, rather than by a flaw in the equipment. surface noise noun 1. noise produced by the friction of the needle or stylus of a record player with the rotating record, caused by a […]
noun 1. (in architectural shades and shadows) a surface in a plane tangent to the parallel rays from the theoretical light source, treated as a shade surface.