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infiltration

Today it means: The act or process of infiltrating, as of water into a porous substance, or of a fluid into the cells of an organ or part of the body. Full definition →

Middle English infiltracioun ← Medieval Latin infiltrātiōnem

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Medieval Latin · derived frominfiltrātiōnem
Middle English · inherited frominfiltracioun
English todayinfiltration

From Middle English infiltracioun, from Medieval Latin infiltrātiōnem, infiltrātiō. By surface analysis, infiltrat(e) + -ion.

Etymology from Wiktionary, CC BY-SA 4.0.