affluent

noun

1. Someone who is wealthy.

   “The affluents are most similar to the professional want-it-alls in their reasons for preferring specific hospitals and in their demographic characteristics.”

2. A stream or river flowing into a larger river or into a lake; a tributary stream; a tributary.

   “It [Central Asia] is separated from the river-system of the Aral and Caspian Seas, […] from the affluents of the Indus and Ganges, on the south, by the chain of the Küen-lün, the rival of the Himalayas, […]”

   “Its sources are everywhere in pine-clad mountains and plateaus, but all of the affluents quickly descend into the desert valley below, through which the Gila winds its way westward to the Colorado.”

   “The affluents of the Amazon are, half of them, of this nature, while the other half are whitish and opaque, the difference depending upon the class of country through which they have flowed.”

adj

1. Abundant; copious; plenteous.

   “The shores are affluent in beauty, and incomparably lovely is the drive to the heights of Castel-a-Mare.”

2. (broadly)Abounding in goods or riches; having a moderate level of material wealth.

   “They were affluent, but aspired to true wealth.”

   “The Upper East Side is an affluent neighborhood in New York City.”

   “One reason, the department suggested, was that affluent New Yorkers were likely to eat expensive fish high in mercury, like swordfish and tuna.”

   “Nevertheless, it is clear that the global energy demand for air-conditioning will grow substantially as nations become more affluent, with the consequences of climate change potentially accelerating the demand.”

3. (dated)Tributary.
4. (obsolete)Flowing to; flowing abundantly.

   “affluent blood”