What does the verb "rarefy" refer to?

The verb "rarefy" refers to the process of becoming less dense or more refined. In a physical sense, it often describes a decrease in density, particularly in relation to gases when they expand and the concentration of their particles decreases. In a figurative context, "rarefy" can also indicate making something more refined or elevated in quality, such as ideas or discourse, suggesting a move towards something more sophisticated or exclusive.

Choosing this term in the context of the question about its definition emphasizes its dual application in both literal and metaphorical frameworks, effectively highlighting the broader implications of refinement and reduction in density.