0 at an angle of 90° to a horizontal line or surface:
The bird floats about in circles and then shoots down perpendicularly to the ground.
This part of the village has narrow streets laid out perpendicularly on either side of a wider, straight street.
She steered past some white cliffs which rose perpendicularly from the water.
The fastest growing wave appears to be a zero-frequency mode, elongated perpendicularly to the plasma inhomogeneity.
The stored vectors should perpendicularly intersect each other to enhance the discriminating capability.
Accordingly, strictly perpendicularly propagating electrostatic waves cannot accelerate particles, because no resonant particles exist.
Under these conditions, the laser pulse within its whole 30 m focus diameter can be regarded as a plane wave perpendicularly irradiating the target.
With two independent, perpendicularly polarized beams with temporal and spatial overlap, it is possible to convert the power from both beams into the second harmonic.
