FO OF AN LGT OVERSHOT ASSIGNED ALT DURING DEP CLB. FLC BLAME MISTAKE ON AN EARLIER NON STANDARD PHRASEOLOGY USED BY THE TWR CTLR FOR TAXIING INTO POS FOR TKOF.

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I SAW MY FO; WHO WAS FLYING; RAPIDLY APCHING OUR 7000 FT CLRED ALT AND CALLED '7000 FT.' HE HESITATED A SECOND AND THEN FIRMLY BUT SMOOTHLY ARRESTED OUR CLB AND BROUGHT US BACK TO 7000 FT OVERSHOOTING IT BY JUST UNDER 300 FT IN THE PROCESS. CONTRIBUTING FACTORS WERE CONCERN OVER NON STANDARD AND THUS CONFUSING WORDING USED BY TWR WHEN CLRED ONTO RWY; V12. 'CLRED TO POS AND THRESHOLD' AND SLIGHT DELAY IN AUTOMATICALLY SWITCHING TO DEP FROM TWR WHICH IS NOT OUR USUAL HABIT PATTERN AS ONE IS SUPPOSED TO DO IT WITHOUT TWR INSTRUCTION AT YYC. ACCORDING TO MY FO CONCERNS AND CONFUSION OVER THE TWR'S USE OF NON STANDARD WORDING WERE THE MAIN DISTRACTIONS AND I CAN CONCUR BECAUSE ALL 3 OF US WERE NOT TOTALLY SURE WHAT TWR MEANT EVEN AFTER REPEATING 'CLRED TO POS AT THRESHOLD.' POS AND HOLD? HOLD SHORT? WE WEREN'T SURE. IF IT HAD BEEN LOW VISIBILITY WE WOULD HAVE QUERIED A THIRD TIME BEFORE ENTERING THE RWY. AND THEN WHEN IN POS ON THE RWY HE ISSUED THE SAME INSTRUCTION TO ACR Y BEHIND US. BOTH OF US IN POS ON THE SAME RWY? HE'S SUPPOSED TO HOLD SHORT AND THUS WE INCORRECTLY DID NOT? VERY CONFUSING AND CONCERNING (AND POTENTIALLY DANGEROUS). YYC NEEDS STANDARD TERMINOLOGY.