American Heritage Dictionary
(7)
Century Dictionary
(3)
GNU Webster's 1913
(2)
WordNet
(4)
Elsewhere on the web
Through market research they found that the best place to infiltrate is the outdoor market, Walters said.— Beatrice Daily Sun News Articles
One key police tactic - infiltrate the anarchists - often meets face-to-face a key tactic of anarchists - expose the infiltrators.— Anarchist news dot org - News for anarchists and their friends
The main gist of the plot is that about 5 groups of 10 terrorists infiltrate, at different times, across the Mexican border.— The Washington Times stories: Latest Headlines
Co-ed groups of military-age Israelis pretending to be students of a non-existent Tel Aviv "arts school" had earlier that year been caught attempting to visit - "infiltrate" - sensitive U.S. security sites, as authoritatively reported at the time by a number of corporate media outlets.— Signs of the Times

Century Dictionary (2)
Bubble size: how much this word was used in a year
Bubble height: used more or less than expected, vs. all uses evenly distributed
You can expect to see this word about twice a month.
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