two-stroke noun 4adjective 1forms 1 noun4 •A two-stroke engine. •A vehicle or machine powered by a two-stroke engine. •The fuel used in a two-stroke engine. •(Australia, slang) Coca-Cola. adjective1 •Of or relating to a design of internal combustion engine, the working cycle of which is completed during two strokes of the piston.This motorbike has a two-stroke engine. formstwo-strokes