Atomic weight and Equivalent weight

Atomic weight noun - (chemistry) the mass of an atom of a chemical element expressed in atomic mass units.

Equivalent weight and atomic weight are semantically related. In some cases you can replace phrase "Equivalent weight" with "Atomic weight", this phrases are similar.

Equivalent weight noun - The atomic weight of an element that has the same combining capacity as a given weight of another element; the standard is 8 for oxygen.

Atomic weight and equivalent weight are semantically related. You can use "Atomic weight" instead a noun phrase "Equivalent weight".