Linked from
The 29 pages that link to Vector, each with the reason it gives.
AccelerationRelated: Velocity and acceleration both require direction as well as magnitude.
Linear algebraRelated: Vectors are the objects that linear combinations and transformations act on.
Affine spaceRelated: Differences of points in an affine space are vectors.
Electric dipoleRelated: The dipole moment points from negative charge toward positive charge.