"U-turn" is a defined term under the NSW Road Rules 2014:
"U-turn means a turn made by a driver so that the driver’s vehicle faces in approximately the opposite direction from which it was facing immediately before the turn was made, but does not include a turn made at a roundabout."
What the dictionary says will have little application, and what a group of people you interview say will have even less.
If I were to hazard a guess, I would say that your argument is that you didn't execute the 'turn' in one continuous motion. If so, I wouldn't bother with trying to make that argument. The execution will be considered secondary to the intention. If the intention was to end up in the opposite direction of travel, roughly, then it will probably be considered a u-turn regardless of how many passes you had to make at it.
If that's not your argument, then please disregard my comment.