Etymology
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affluent (adj.)

early-15c., "abounding in, copious" (of God's grace); mid-15c. "flowing to" (of liquids), both senses now obsolete, from Old French afluent (14c.) or directly from Latin affluentem (nominative affluens) "abounding, rich, copious," literally "flowing toward," present participle of affluere "flow toward," from assimilated form of ad "to" (see ad-) + fluere "to flow" (see fluent). The especial sense of "abounding in wealth or possessions" is from 1753.

updated on February 20, 2017

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Definitions of affluent from WordNet
1
affluent (n.)
an affluent person; a person who is financially well off;
the so-called emerging affluents
affluent (n.)
a branch that flows into the main stream;
Synonyms: feeder / tributary / confluent
2
affluent (adj.)
having an abundant supply of money or possessions of value;
an affluent banker
Etymologies are not definitions. From wordnet.princeton.edu, not affiliated with etymonline.