Square of the correlation coefficient the proportion of the variability in one series that can be explained by the variability of one or more other series. The New York Times Financial Glossary
Square of the correlation coefficient proportion of the variability explained by the linear regression model. For example, an r squared of 75% means that 75% of the variability observed in the dependent variable is explained by the independent variable. The New York Times Financial Glossary
Financial and business terms. 2012.