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[eks-fil-treyt, eks-fil-treyt] /ɛksˈfɪl treɪt, ˈɛks fɪlˌtreɪt/
verb (used without object), exfiltrated, exfiltrating.
to escape furtively from an area under enemy control.
verb (used with object), exfiltrated, exfiltrating.
to smuggle (military personnel) out of an area under enemy control.
Origin of exfiltrate
1965-70; ex-1 + (in)filtrate
Related forms
exfiltration, noun Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the web for exfiltrate
  • The infiltration capacity of the subgrade determines how much water can exfiltrate from the aggregate into the surrounding soils.
  • Usually, individuals had to exfiltrate enemy territory by hazardous land routes.
  • Envelope cracks above this plane exfiltrate and openings below infiltrate.
  • The water in the wetlands is allowed to infiltrate and the groundwater is allowed to exfiltrate into the wetland.
  • However, limited air exchange also means it will take a much longer time for the contaminant to exfiltrate.
  • Pitting is highly localized corrosion causing perforations large enough to infiltrate or exfiltrate water.
  • In badly corroded lines the sewage or wastes can exfiltrate, contaminating groundwater.
Contemporary definitions for exfiltrate

to withdraw troops surreptitiously, esp. from a dangerous position

Word Origin

opposite of infiltrate, back formation of exfiltration 'filtering out''s 21st Century Lexicon
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