infiltration.

1. The entry of people or agents into a group or place secretly or without ordinary open access.

2. The passage or penetration of a substance, liquid or cells into a material, area or tissue.

Use it for

Words that belong together

• covert infiltration
• infiltration of an organization

On the page

Covert infiltration gave the investigators access to information they could not otherwise obtain.

The story left the infiltration of the organization visible through small inconsistencies rather than a direct announcement.

Usage notes

Primary category: horror / sci-fi / gothic. Forms: Usually uncountable. Legacy lexical fields mirror sense 1 only. Use numbered sense fields for all meanings. Established modern English lexical item. No separate regional spelling or grammatical inflection entry. Writing functions: hazard description, speculative setting, bodily condition, scene explanation. Disciplines: genre writing, science-informed description, clinical and safety vocabulary. Commonness: moderately common.