General Meaning:
* The mass of the Earth is much larger than the mass of the Moon.
* The mass of the crowd was so large it took hours to clear the stadium.
* He gained a significant amount of mass after he started lifting weights.
Specific Meanings:
* The priest celebrated mass in the cathedral. (religious service)
* We need to produce the mass of a new product in order to meet demand. (large quantity)
* The mass media plays a significant role in shaping public opinion. (media as a whole)
Figurative Language:
* The mass of the data was overwhelming. (meaning a large amount of information)
* His mass of hair was like a tangled forest. (meaning a large, thick amount of something)
The meaning of "mass" will depend on the context of the sentence.