The act of passing back; passage back; return; retrogression.

The power or liberty of passing back.

In property law, the right of a person (such as a lessee) to return to a property.

To move backwards to an earlier stage; to devolve.

To move from east to west.

To perform a regression on an explanatory variable.

“When we regress Y on X, we use the values of variable X to predict those of Y.”