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TeachMeFinance.com - explain purposeful interference purposeful interference 'purposeful interference' is an military term. It means '(DOD) In space operations, deliberate actions taken to deny or disrupt a space system, service, or capability. Purposeful interference threats include but are not limited to: mission uplink or downlink interference; command uplink interference; telemetry downlink jamming; positioning jamming; unauthorized access; information insertion; and signal probing. Also called PI'. Previous 5 Terms: pull-up point - pulse duration pulsejet pulsing_ purchasing office _ Next 5 Terms: pursuit - pyrotechnic delay q-message quadrant elevation_ quadruple container _ Copyright © 2005-2011 by Mark McCracken, All Rights Reserved. TeachMeFinance.com is an informational website, and should not be used as a substitute for professional medical, legal or financial advice. Information presented at TeachMeFinance.com is provided on an "AS-IS" basis. Please read the disclaimer for details.