a statistic representing how closely two variables co-vary; it can vary from -1 (perfect negative correlation) through 0 (no correlation) to +1 (perfect positive correlation)
a reciprocal relation between two or more things
a statistical relation between two or more variables such that systematic changes in the value of one variable are accompanied by systematic changes in the other
a practical consequence that follows naturally
(logic) an inference that follows directly from the proof of another proposition
