Which term refers to something that is associated with the great masses of people?

The term that refers to something associated with the great masses of people is "plebeian." Historically, "plebeian" originates from ancient Rome, where it denoted the common people as opposed to the elite or patrician class. Thus, in contemporary usage, it embodies the idea of the general populace, often suggesting characteristics or qualities typical of the masses rather than those of the privileged few.

In contrast, the other terms carry distinct connotations. "Elite" signifies a select group considered superior, often in terms of status, wealth, or abilities. "Aristocratic" relates to the nobility or an upper class that inherits power and privilege. Meanwhile, "intellectual" describes someone deeply engaged in critical thought or scholarly pursuits, usually not tied to a mass audience but rather to specialized or academic circles. This differentiation highlights why "plebeian" is the most fitting term for the question at hand.