TeachMeFinance.com - explain intruder
intruder 'intruder' is an military term. It means '(DOD) An individual, unit, or weapon system, in or near an operational or exercise area, which presents the threat of intelligence gathering or disruptive activity'.
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Author: Mark McCracken is a corporate trainer and author living in Higashi Osaka, Japan. He is the author of thousands of online articles as well as the Business English textbook, "25 Business Skills in English".