/ ˈɪnfɪltreɪt; NAmE / verb
1.
infiltrate (sb) (into sth) to enter or make sb enter a place or an organization secretly, especially in order to get information that can be used against it :
[ vn ]
The headquarters had been infiltrated by enemy spies.
Rebel forces were infiltrated into the country.
[ v ]
The CIA agents successfully infiltrated into the terrorist organizations.
2.
infiltrate (into) sth ( technical ) ( especially of liquids or gases ) to pass slowly into sth :
[ v ]
Only a small amount of the rainwater actually infiltrates into the soil.
[also vn ]
► in·fil·tra·tion / ˌɪnfɪlˈtreɪʃn; NAmE / noun [ U ]:
communist infiltration of the army
the infiltration of rain into the soil
••
WORD ORIGIN
Middle English (as infiltration ): from in- + filtrate .