in·fil·trate ( n-fl tr t , nfl-)v. in·fil·trat·ed, in·fil·trat·ing, in·fil·trates v.tr. 1. a. To pass (troops, for example) surreptitiously into enemy-held territory. b. To penetrate with hostile intent: infiltrate enemy lines; terrorists that had infiltrated the country. 2. To enter or take up positions in gradually or surreptitiously, as for purposes of espionage or takeover: infiltrated key government agencies with spies. 3. To cause (a liquid, for example) to permeate a substance by passing through its interstices or pores. 4. To permeate (a porous substance) with a liquid or gas. v.intr. To gain entrance gradually or surreptitiously. n. One that infiltrates, especially an abnormal substance that accumulates gradually in cells or body tissues. in·fil tra·tive (-tr -tv) adj.in·fil tra·tor n. |
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