infiltrate

Estimated CEFR level: C2 — Proficiency

Estimated from word frequency; not an official CEFR classification.

Definition

From Middle English infiltrate (adjective), from Medieval Latin infiltrātus, from infiltrō.

A few morning gleams infiltrated the liquid strata. — Twenty Thousand Leagues Under the Seas: An Underwater Tour of the World, Jules Verne
"Then I could easily infiltrate--" "You could what?" — "And That's How It Was, Officer", Ralph Sholto
[C7-322] Bringuier claimed that on August 5, 1963, Oswald had attempted to infiltrate an anti-Castro organization with which he was associated. — Report of the President's Commission on the Assassination of President John F. Kennedy, United States. Warren Commission

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