Definition
REQUEST FULL ROUTE CLEARANCE
Used by pilots to request that the entire route of flight be read verbatim in an ATC clearance. Such request should be made to preclude receiving an ATC clearance based on the original filed flight plan when a filed IFR flight plan has been revised by the pilot, company, or operations prior to departure.
Source: FAA Pilot/Controller Glossary (verbatim from the Federal Aviation Regulations).