Quoting from Wiki is a bit like quoting from the Bible: there's always another quote!

"In geometry, a position or position vector, also known as location vector or radius vector, is a Euclidean vector which represents the position of a point P in space in relation to an arbitrary reference origin O."

Locating a point is relevant only in relation to another point, so identifying movement is relevant only with reference to some other thing.

The Earth rotates once in 24hrs relative to the sun. If there were nothing else in the Universe, could you still say that the Earth rotates?

There never was nothing.