The definition of inbound is something that moves inward. An example of inbound is the freeway that goes toward the city center. 1  traveling or going inward.  Basketball inbounds.
Mass is a measurement of how much matter is in an object. Mass is a combination of the total number of atoms, the density of the atoms, and the type of atoms in an object. How to Measure Mass.
Mass. 1. the measure of the amount of matter in an object. 2. the measure of how much matter is contained in an object. 3. the component of matter that gives it weight in a gravitational field.