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Definition of infiltrator

infiltrator

/ˈɪn.fɪl.treɪ.tər/
in · fil · tra · tor
Plural:infiltrators
•
Adjective:infiltrative
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infiltrator Lexical Profile

infiltrator Game Scores & Validity

• noun

1

A person who secretly or surreptitiously enters, joins, or gains access to a place, group, or organization, typically to gather confidential information or exert influence from within.

Example

"Corporate security discovered that an infiltrator had been accessing proprietary research files for several months."

Synonyms
View all synonyms for infiltrator

• Nearby Words

infill
infiltrate
infiltration
infiltrator
infinite
infinitely
infiniteness

Word Origin & Etymology

Formed in the mid-20th century as an agent noun from the verb 'infiltrate', which derives from Medieval Latin 'infiltratus', originally meaning 'to pass through a filter' (from 'in-' meaning 'into' and 'filtrum' meaning 'felt used as a strainer').

Cite this Entry

Wordmom. (2026). Definition of Infiltrator. In Wordmom Dictionary. Retrieved Nov 5, 2026, from https://wordmom.com/dictionary/infiltrator
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