Expansion refers to the process of increasing in size, volume, or scope. This can occur in various contexts, such as in business, where a company may expand its operations to new markets or increase its product offerings. In science, expansion can describe the growth of the universe or the increase in temperature causing gases to expand. In economics, expansion often indicates a phase of growth in the business cycle, characterized by rising employment and production. Similarly, in geography, expansion can refer to the spread of populations or cultures into new areas. Overall, expansion signifies a movement towards greater scale or influence.