An equivalent weight.
Anything that is virtually equal to something else, or has the same value, force, etc.
Having the equal ability to combine.
Similar or identical in value, meaning or effect; virtually equal.
Of a map, equal-area.
Equal in measure but not admitting of superposition; applied to magnitudes.
Of two sets, having a one-to-one correspondence.
Relating to the corresponding elements of an equivalence relation.
To make equivalent to; to equal.