Anything that is virtually equal to something else, or has the same value, force, etc.

An equivalent weight.

To make equivalent to; to equal.

Similar or identical in value, meaning or effect; virtually equal.

“To burn calories, a thirty-minute jog is equivalent to a couple of hamburgers.”

Of two sets, having a one-to-one correspondence; equinumerous.

Relating to the corresponding elements of an equivalence relation.