AN ACR CREW STARTS TKOF WITHOUT CLRNC. NONSTANDARD ATC TERMINOLOGY AND CREW EXPERIENCE ARE ISSUES.

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WE DEPARTED THE GATE APPROX 45 MINS LATE WITH THE ACARS DEFERRED. DUE TO MY INEXPERIENCE; I WAS MORE ABSORBED THAN NORMAL IN MY TAXI OUT PROCS AND I WAS COMMUNICATING WITH LOAD PLANNING AND GETTING A VERBAL MANIFEST CHK. I HAD XFERRED RESPONSIBILITY FOR MONITORING VHF #1 TO THE CAPT. I WAS STILL VERY MUCH 'HEADS DOWN' WITH THE WTS AND CHKLIST AS WE APCHED AND ENTERED THE RWY. IT WAS NOT UNTIL AFTER WE HAD TAKEN POS AND HOLD DID I RECONFIGURE MY COM PANEL BACK TO VHF #1. AS A RESULT; I HAD NOT ACTUALLY MONITORED THE ATC CLRNC FOR POS AND HOLD. THE FINAL ITEMS WERE JUST COMPLETE AND THE CAPT ASKED 'ARE YOU READY?' I SAID I WAS. WE BEGAN THE TKOF ROLL; AND AT 40 KTS THE TWR CALLED AND SAID 'HOLD YOUR POS.' THE CAPT IMMEDIATELY ABORTED THE TKOF. IT BECAME CLR THAT WE DID NOT HAVE A CLRNC FOR TKOF. WE EXITED THE RWY; AND TAXIED BACK FOR A N UNEVENTFUL TKOF. I CAN SAY THAT A QUESTION ABOUT OUR CLRNC FLASHED THROUGH MY MIND WHEN ASKED IF I WAS READY; HOWEVER; I SUPPRESSED IT AS IT SEEMED THE CAPT WAS CLR ABOUT OUR CLRNC. SUPPLEMENTAL INFO FROM ACN 520502: STARTED TKOF BEFORE TWR CLRED US. TWR GAVE COMMAND TO TAXI INTO POS AND HOLD. WE SAID WE WEREN'T READY; TWR SAID ONTO HOLD YOU CAN GO WHEN READY. STARTED TKOF AND TWR SAID WE WERE NOT CLRED. WE ABORTED AT 35-40 KTS. EXITED RWY AT TXWY G ON RWY 1L; TAXIED BACK AND HAD NORMAL FLT. I FELT THAT I (CAPT) MISSED THAT THE FO WAS OVERLOADED AND FELL INTO TRAP OF TAKING RWY BEFORE WE WERE READY. ALSO I HAD 38 HRS OF DEADHEAD AND FLYING IN THE LAST 6 DAYS CAUSING A FATIGUE PROB. OTHER FACTORS ARE: NO ACARS; NEW FO; AND TWR TRAINEE WHO USED NEW TERMINOLOGY. TRAINEE IN TWR DID SEE US IMMEDIATELY. TO HIS CREDIT. THIS PREVENTED A LATER ABORT FOR US. WHEN WE DID ABORT; WE WERE VERY SLOW; BUT VERY CONCERNED ABOUT WHAT COULD HAVE HAPPENED.