infiltration

Estimated CEFR level: C2 — Proficiency

Estimated from word frequency; not an official CEFR classification.

Definition

noun a process in which individuals (or small groups) penetrate an area (especially the military penetration of enemy positions without detection)
noun the slow passage of a liquid through a filtering medium

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

Infiltration had taken place, a slip had followed. — Les Misérables, Victor Hugo
You must protect yourselves as well as you can from this infiltration. — Memoirs of Napoleon Bonaparte — Complete, Louis Antoine Fauvelet de Bourrienne
Pitt’s surroundings were not such as to favour the infiltration of new ideas. — William Pitt and national revival, J. Holland (John Holland) Rose

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