That psychological property of sound characterized by highness or lowness, depending primarily upon frequency of the sound stimulus, but also upon its sound pressure and waveform.

The ratio of the rise of a roof to its span.

The distance between the centerlines of adjacent rows of hole positions in punched paper tape.

The distance between similar elements arranged in a pattern or between two points of a mechanical part, as the distance between the peaks of two successive grooves on a disk recording or on a screw.

See <<plunge>>

The number of characters printed per horizontal inch on a typewriter or computer printer.

A dark heavy liquid or solid substance obtained as a residue after distillation of tar, oil, and such materials; occurs naturally as asphalt.

1. Of an aerospace vehicle, an angular displacement about an axis parallel to the lateral axis of the vehicle.

2. The rising and falling motion of the bow of a ship or the tail of an airplane as the craft oscillates about a transverse axis.

The distance between two adjacent turns of double-stranded deoxyribonucleic acid.

The inclination or degree of slope of an object or structure.