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Definitions

infiltrate

[in-fil-treyt, in-fil-treyt] / ɪnˈfɪl treɪt, ˈɪn fɪlˌtreɪt /
VERB
creep in
Synonyms
STRONGEST
penetrate permeate pervade
STRONG
access crack foist impregnate insinuate percolate saturate tinge
WEAK
edge in filter through sneak in work into worm into

Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

Bainton said the aim of surgery is always to remove the affected tissue while preserving healthy organs, but that this can be challenging because endometriosis can cause fibrosis and may infiltrate nearby structures.

From BBC • Apr. 4, 2026

That has not stopped Ukrainian President Volodymyr Zelensky vowing to infiltrate the messenger.

From Barron's • Mar. 23, 2026

Dan and Tamma are climbing toward something, of course: He’s pursuing a college scholarship and she is determined to infiltrate the world of professional climbers.

From Los Angeles Times • Jan. 20, 2026

The plot involves an Indian spy who goes undercover to infiltrate a powerful gang in Karachi, Pakistan’s largest city.

From The Wall Street Journal • Dec. 17, 2025

We have a bird feeder out there that every squirrel in the forest is trying to infiltrate, which drives Dad crazy.

From "Please Ignore Vera Dietz" by A.S. King