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1. The discharge of a fluid from some container
   "they tried to stop the outflow of gas from the damaged pipe";
   - escape, leak, leakage
    
2. The process of flowing out
   - effluence, efflux
    
3. A natural flow of ground water
   - spring, fountain, outpouring, natural spring

Derived forms: outflows

Type of: discharge, flow, formation, geological formation, outpouring, run

Antonym: inflow

Encyclopedia: Outflow