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.
Definition of mass. 1  1a : of or relating to the mass of the people mass market; also : being one of or at one with the mass : average mass manb : participated in by or affecting a large number of individuals mass destructionc : having a large-scale character mass plantings of tulips. 2  2 : viewed as a whole : total the mass effect of a design.