The sound produced, in an internal combustion engine, by the ignition of the fuel-air mixture before the piston reaches top dead centre

A gap, between two electrical terminals, across which sparks are generated. / Such a gap as a component of an engine's ignition system, especially that between the electrodes of a spark plug.

(transitive) To initiate something by providing the necessary conditions.

(colloquial, often ironic) A person who is intelligent, clever or quick-witted.

(Britain, colloquial) The retailer Marks & Spencer.

A method of determining the general classification of ferrous materials that normally requires taking a piece of metal, usually scrap, to a grinding wheel and observing the sparks emitted.

present participle of spark test

plural of spark plug

plural of spark gap

plural of spark knock