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infiltrator

DEFINITIONS OF: infiltrator

1

n someone who takes up a position surreptitiously for the purpose of espionage

Type of:
spy, undercover agent
(military) a secret agent hired by a state to obtain information about its enemies or by a business to obtain industrial secrets from competitors

n an intruder (as troops) with hostile intent

Type of:
interloper, intruder, trespasser
someone who intrudes on the privacy or property of another without permission
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