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I consider mass and inertia to be the same thing. Inertia is the word one tends to use when one is talking about the concept and mass is the word one tends to use when one wants to assign a value to it. It is often said that "Mass is a measure of inertia." (That phrase, in quotes, gets 65,100 hits on Google.) I prefer "Mass is inertia." which only gets 18,200 hits.