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 noun. 1  1The matter from which a thing is or can be made. âgoats can eat more or less any plant materialâ. 2  2Information or ideas for use in creating a book or other work. âhis colonial experiences gave him materialâ. 3  3Cloth or fabric. âa piece of dark materialâ.