We rented a four-door for the family vacation.

In special relativity, the four-force acting on a charged particle can be derived from the Lorentz force when expressed in terms of four-vectors.

In special relativity, the conserved quantity for a free particle is its four-momentum, which combines energy and three-momentum into a single four-vector.

The four-acceleration of the charged particle determined how rapidly its radiation changed as it followed a curved path through spacetime.

The four-velocity of the particle defines its trajectory through spacetime and is essential for relativistic dynamics.

The coach decided to keep the stretch four in the rotation because his outside shooting opened up driving lanes for the guards.

The captain relied on the back four to protect the lead in the final minutes.

Historians debate how much power the Gang of Four actually held during the Cultural Revolution.

The classic car museum displayed several beautifully restored four-doors from the 1950s.

The shop displayed several four-in-hands in the window, attracting passing collectors.