1. Any one of the number of ways in which the space configuration of a mechanical system may change.

2. Of a gyro, the number of orthogonal axes about which the spin axis is free to rotate, the spin axis freedom not being counted; this is not a universal convention; for example, the free gyro is frequently referred to as a three-degree-of-freedom gyro, the spin axis being counted.

Any one of the variables, including pressure, temperature, composition, and specific volume, which must be specified to define the state of a system.

A number one less than the number of frequencies being tested with a chi-square test.