In the actual process of landing a flare in my books is continuing back pressure ie a large movement on the column with the effect of destroying lift so that the aircraft gets to a point where sink occurs.
Destroying lift so that the a/c gets to a point where sink occurs.
Not so, in fact a very bad explanation which I would interpret as stalling the aircraft above the ground. You are not destroying lift(thats done on the ground by decleration or devices such as air brakes or spoilers) you are in fact reducing the amount of lift to below that required to maintain level flight, thats what produces the descent which you call sink.
Flare is an adjustment of the A of A to reduce the rate of descent before touchdown-its secondary effect is to put the aircraft in the landing attitude. The amount of elevator or stabiliser movement needed to achieve this adjustment has many different variables even on the same aircraft-speed,weight, density, C of G, thermal activity, sink/wind, turbulence and of course the height that you choose to round out has a bearing on this too.