Correlation (تضايف) links meanings that are understood in relation to one another, such as parent and child, teacher and pupil, or greater and lesser. One concept naturally calls up the other because their intelligible relation is reciprocal.
For example, “The teacher instructs, and the student learns” states different actions that share a rational relationship. Cause and effect may likewise give two reports a coherent connection.
Do not confuse correlation with contradiction or contrariety. Parent and child are relational counterparts, not the negations of each other. Black and white illustrate a different mode of contrast.