Mass per unit volume is called density
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Density is defined as mass of the object per unit volume.

In simple words, Density means Mass divided by Volume.

So, Density = Mass / Volume

The SI Unit of density is  kg/m³
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hey related density is also related to density you should also describe that.
not only related density ,charge density ,linear charge density and volume charge density is also related to density but the question is definition of density not its types.
according to question no one can say my ans is wrong.