Webster's English Dictionary

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infiltrate

in.fil.trate \in-'fil-.tra-t, 'in-(.)fil-\ \.in-(.)fil-'tra--sh*n\ 
   \'in-(.)fil-.tra-t-iv, in-'fil-tr*t-\ \-.tra-t-*r\ vt 1: to cause something 
   (as a liquid) to enter by penetrating the interstice s of 2: to pass into 
   or through by filtering or permeating  3: to pass (troops) singly or in 
   small groups through gaps in the enemy li ne 4: to enter or become 
   established in gradually or unobtrusively  : to enter, permeate, or pass 
   through a substance or area of filtering  - in.fil.tra.tion n