Semivariance refers to a statistical concept used to measure the risk associated with a particular investment or asset. It is the average of the squared differences between a specific value and the mean value of a set of data points that are below the mean value. Synonyms for semivariance include downside deviation, semideviation, and downside risk. These terms are commonly used in financial analysis to assess the potential downside of an investment and to provide investors with a more comprehensive understanding of the risk involved. By using these synonyms, investors can better evaluate investment opportunities and make informed decisions that align with their financial goals.