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say it: in-fil-TRAY-shuhn
infiltration is a noun meaning "a process in which individuals (or small groups) penetrate an area (especially the military penetration of enemy positions without detection)". It carries 2 recorded senses.
a process in which individuals (or small groups) penetrate an area (especially the military penetration of enemy positions without detection)
military
the slow passage of a liquid through a filtering medium
“the percolation of rainwater through the soil”
“the infiltration of seawater through the lava”
Forms marked · are formed by the regular rule rather than recorded in the source data. English keeps a few hundred irregulars and the rest follow the pattern, so the rule is right far more often than not — but it is a rule, and the mark says so.
Definitions, synonyms and semantic relations for infiltration come from Princeton University’s WordNet. The pronunciation comes from the CMU Pronouncing Dictionary. Commonness is measured against a corpus of everyday English. Full sources and licences.