Mass is the characteristic of a body that we can feel as weight. But as opposed to weight, mass does not depend on your position. Your mass is the same whether you're on the earth or on the moon. However, if you would weigh yourself with a scale on the moon, you'd only be about 1/6 of the weight you have on the earth.

In particle physics, we always mean rest mass when we're talking about mass.

About Mass in German. (Masse)