(It would mean that it had simultaneously zero momentum and well-defined position, which contradicts Heisenberg's uncertainty principle).

The uncertainty principle says that particles cannot have both a well-defined position and a well-defined velocity.

In this theory particles no longer had separate, well-defined positions and velocities that could not be observed.

In this view, each particle has a well-defined position and momentum, but is guided by a wave function derived from Schrödinger's equation.

The measurement will return a well-defined position, (subject to uncertainty), a property traditionally associated with particles.

The United States has a well-defined position.

Each shot in an artistic billiards match is played from a well-defined starting position.

The latter group is undisturbed by the acoustic field, so it remains parallel and forms a point in a well-defined position in the focal plane.

Still, tigers had a well-defined position in folkloric beliefs and magic.

An interest point is a point in an image which has a well-defined position and can be robustly detected.