Meaning of “infiltration” in the English Dictionary

"infiltration" in English

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infiltrationnoun [ U ]

/ˌɪn.fɪlˈtreɪ.ʃən/ /ˌɪn.fɪlˈtreɪ.ʃən/

specialized medical the process in which substances build up in tissue or cells where they are not normally found or where they are normally found in much lower amounts:

Neuropathic pain is caused by infiltration of nervous tissue by cancer cells.

(Definition of “infiltration” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)