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 that causes materials to expand. In economics, expansion often indicates a period of growth in economic activity, characterized by rising GDP and increased consumer spending. Similarly, in geography, expansion can refer to the spread of populations or urban development into new areas. Overall, expansion signifies a movement towards greater size or influence.