infiltration
noun /ˌɪnfɪlˈtreɪʃn/
/ˌɪnfɪlˈtreɪʃn/
- [uncountable, countable] infiltration (of somebody) (into something) the act of entering a place or an organization secretly, especially in order to get information that can be used against it
- the infiltration of terrorists from across the border
- [uncountable] infiltration (of something) (into something) the process of passing slowly into something
- the infiltration of rain into the soil