[quote=LegendBegins]
It's when something moves something else. Such as water displacement.
[/quote]

Not in this case. Displacement as referred to in physics is a vector. The magnitude is the distance from the point of origin and the direction is, well, the direction. In relation to how you've oriented the coordinate plane. If it's one dimensional, then there's only positive and negative directions, and if it's 2D, there's northeast, south, etcetera.