in·flux \ˈinˌfləks\noun Etymology: Late Latin influxus, from Latin influxus, past participle of influere to flow in — more at influence 1.obsolete: influence 2.: a flowing in : inflow < influx of light > < influx of air > 3.: a continuous coming especially of individuals in large numbers < the city expected an influx of holiday visitors > 4.: the mouth or debouchment of a river