PRESSURED BY COMPANY AND ATC TO DEPART; INEXPERIENCED CAPT OF CRJ-700 TAKES OFF WITH IMPROPERLY ANNOTATED AML.

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I FAILED TO OBTAIN MAINT CTL AUTH FOR A R FADEC #1 FAULT STATUS MESSAGE (MEL). WE PUSHED OFF THE GATE AND HELD ON THE RAMP FOR OVER 2 HRS DURING A GND STOP INTO ORD. WHEN GND INFORMED US TO EXPECT ANOTHER 1 HR 40 MIN DELAY; I DECIDED TO START THE L ENG AND RETURN TO THE GATE. WHILE TAXIING IN; GND INFORMED US WE WOULD BE RELEASED IMMEDIATELY; WE STARTED THE R ENG; PROCEEDED TO RWY 26L AND PREPARED FOR TKOF. WE NOTICED THE R FADEC #1 FAULT MESSAGE. WE PULLED OFF NEAR THE HOLD SHORT; AND INFORMED TWR WE NEEDED A COUPLE OF MINS. I READ THE MEL 73-4 AND REALIZED WE COULD DEFER THE ITEM. TWR INFORMED US WE HAD 3 MINS TO TAKE OFF OR LOSE OUR SLOT. ADDITIONALLY; WE WERE APCHING OUR MINIMUM TKOF FUEL QUANTITY. I NOTICED IN MEL 73-4 A COLUMN TITLED 'ADVANCED NOTIFICATION TO DISPATCH REQUIRED' WITH A 'NO' LISTED BENEATH IT. I INCORRECTLY ASSUMED THIS INSTRUCTION APPLIED TO CREW PLACARDING PROCS. SEEING AN OPPORTUNITY TO GET AIRBORNE AND AVOID ADDITIONAL DELAY; I THOUGHT THIS LANGUAGE IN THE MEL GAVE ME RELIEF FROM CONTACTING MAINT CTL FOR AUTH. UNSURE; I CALLED MY DISPATCHER ON MY CELL PHONE AND DISCUSSED IT WITH HIM. HE GAVE ME A DATE/TIME GROUP FOR THE MEL; AND WE LAUNCHED. DURING CRUISE; I REVIEWED THE FLT CREW PLACARDING INSTRUCTIONS IN THE GENERAL SECTION OF THE MEL AND REALIZED MY MISTAKE. I WROTE UP THE DISCREPANCY AND RPTED IT TO MAINT UPON LNDG. CAUSE: I FAILED TO COMPLY WITH THE MEL PROCS NOT FROM BLATANT DISREGARD; BUT RATHER FROM MY POOR UNDERSTANDING AND INEXPERIENCE WITH MEL PROCS COUPLED WITH SELF-INDUCED PRESSURE TO GET AIRBORNE TO AVOID ADDITIONAL DELAY.