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affluent

affluent: [15] The meaning ‘rich’ is a fairly recent development for affluent; it is first recorded in the mid 18th century. Originally the adjective meant simply ‘flowing’. It came, via Old French, from Latin affluent-, the present participle of affluere, a compound verb formed from the prefix ad- ‘towards’ and fluere ‘flow’ (the source of English fluid, fluent, flux, fluctuate, and many other derivatives).
=> fluctuate, fluent, fluid, flux