Ok, everybody, how about we get the thread back to where it started, and attempt to give the OP some suitable and sensible answers. The last few pages have contained overly dry and technical definitions which we can safely assume would not be suitable for his target audience.
The OP quite rightly assumed that, of all the places in the world, this was the one that should have given him exactly the answers he needed, in exactly the wording appropriate for the audience. We can do far better. I believe the following is more along the lines of what he was looking for:
V1:
That speed attained during the takeoff roll, after which, an aborted takeoff will likely result in the aircraft coming to a stop at a point beyond the end of the runway. The pilots use this speed to dictate whether, in the event of a significant failure during the takeoff acceleration, they should abort or continue the takeoff. V1 is the first of three milestone speeds that the aircraft must achieve during every takeoff. The others, in order, are Vr and V2.
Vr:
The "rotate" speed. On reaching this speed during the takeoff acceleration the pilot initiates the pitch up that causes the aircraft to leave the ground. This pitching action is known as "rotation".
V2:
That speed attained during takeoff at which the aircraft has a comfortable margin above speeds such as the stalling speed, where the controllability of the aircraft is not assured. V2 is the last of the three milestone speeds that an aircraft achieves during the takeoff and occurs a few seconds after becoming airborne. The others are V1 and Vr.