affluent

Short definition from Wiktionary

Noun

1. 1
   Somebody who is wealthy.
2. 2
   A stream or river flowing into a larger river or into a lake; a tributary stream; a tributary.

Adjective

1. 1
   Abundant; copious; plenteous.
2. 2
   Abounding in goods or riches; having a moderate level of material wealth.
3. 3
   Tributary.
4. 4
   Flowing to; flowing abundantly.