Much of that light came vertically through the atmosphere and was scattered into the horizontal direction.

This coefficient determines how much force you can apply in the horizontal direction before your feet slip.

Now the tunnel had ceased its descent and was leading in a horizontal direction.

A section of a route that requires progress in a horizontal direction.

The wind was propelling the sand in a horizontal direction.

It can simultaneously be read in horizontal and vertical directions.

Shooting can be done in a horizontal, vertical or diagonal direction.

The ruler doesn't only work in the horizontal direction.

In this case, the horizontal direction is typically from the left side of the paper to the right side.

Assume the car takes off in a perfectly horizontal direction.