[1] : The Collaborative International Dictionary of English v.0.48

outflow \out"flow`\, n.
   a flowing out; efflux.
   1913 webster

[2] : The Collaborative International Dictionary of English v.0.48

outflow \outflow"\, v. i.
   to flow out. --campbell.
   1913 webster

[3] : WordNet (r) 2.0

outflow
     n 1: the unwanted discharge of a fluid from some container; "they
          tried to stop the escape of gas from the damaged pipe";
          "he had to clean up the leak" syn: escape, leak, leakage
     2: the process of flowing out syn: effluence, efflux
        ant: inflow, inflow
     3: a natural flow of ground water syn: spring, fountain, outpouring,
         natural spring
see also:
escape leak leakage effluence efflux inflow 
spring fountain outpouring natural spring 

[4] : Moby Thesaurus II by Grady Ward, 1.0

74 moby thesaurus words for "outflow":
   affluence, afflux, affluxion, blow out, concourse, confluence,
   conflux, course, crosscurrent, current, defluxion, discharge,
   downflow, downpour, drain, drain out, drainage, drift, driftage,
   effluence, efflux, effluxion, effusion, empty, exhalation, exhaust,
   find vent, flow, flow out, flowing, flowoff, fluency, flux, gush,
   gush out, inflow, jet, mill run, millrace, money going out, onrush,
   onward course, outfall, outflowing, outgo, outgoings, outlay,
   outpour, outpouring, pour, pour out, race, run, run out, runoff,
   rush, set, sluice out, spate, spendings, spew out, spout,
   spout out, spurt, stream, surge, tide, trend, undercurrent,
   undertow, vomit forth, water flow, well, well out

Outflow >> O Words
Outflow, definition of term: Outflow
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