Someone who takes up a position surreptitiously for the purpose of espionage

Usage examples of infiltrator.

The men and dogs soon became so adept at defense that the infiltrating team served only as a training mechanism for the defending team--the infiltrators always got caught.

That was why it had decided to retire its Luddite allies rather than use them as infiltrators.

For the next hour, Leia and the others watched the war droid work his way through a broad assortment of combat problems, locating concealed Yuuzhandroids through solid durasteel, tracking multiple escapees, and, most impressive to Leia, capturing a trio of ooglith-masqued infiltrators without harming anyone in a crowd of bystanders.

Yuuzhan Vong infiltrators were trained to withstand even modern interrogation techniques.

The infiltrators instantly began to rustle beneath their jumpsuits for their gnulliths, but Viqi pulled her hold-out blaster from its hiding place and started after die droid.

Leia stood and turned to find Han already describing the infiltrators to Garv.

The alliance led to a confrontation in which the deceit and scheming of the Jevlenese was exposed, revealing the network of infiltrators by which they had endeavored to subvert modern-day Earth after the attempts to block its technological advancement failed.

Two of the infiltrators were lying contentedly in the gravel, engulfing the bodies of their deceased comrades without a care for the crossbow quarrels sticking straight up, but half a dozen others were making straight for the farrowing pens.

The play gets rough sometimes, especially for the goon squads, infiltrators, and others who choose to play in exposed positions.

Another parallel is that of Thomas Martinez, the FBI infiltrator within the radical right Silent Brotherhood, who was given an honorable discharge during basic training.

They nailed him for being an illegal alien, then stomped over him for being responsible for releasing the wild card virus, and to top it all of they demanded the names of the aces he'd treated, just in case some of them happened to be evil infiltrators influencing the minds of America at the behest of Uncle Joe Stalin.

The Viet Cong protested the intrusion into their territory with land mines, infiltrators, mortars, and snipers.

It's not like he was a Commie that was going to corrupt the morals of Mason City, or even that he was a Peace Corps volunteer that crossed some Leninist infiltrator.

Working in a tiny underground bunker, the handful of intercept operators pinpointed enemy infiltrators, artillery units moving toward the border, and mobile surface-to-air missiles through voice and coded intercepts.