1. streams or rivers that flow into a larger river or lake; tributaries
Usage: geography; hydrology
2. wealthy people; those having abundant resources or income
Usage: formal

Examples

• The Mississippi River has many affluents that drain the central United States.
• Several small affluents join the main river before it reaches the sea.
• The affluents of the Amazon carry sediment from the mountains.
• The resort caters primarily to affluents from major cities.
• Many affluents invest in luxury real estate.
• The tax policy affects affluents differently than middle-class families.