Definitions
1.nounInitialism of date of filing.
2.nounAny of the coordinates, a minimum number of which are needed to specify the motion of a mechanical system.
3.nounAny of the independent variables required to specify the thermodynamic state of a system containing components and phases.
4.nounAny unrestricted variable in a frequency distribution.
5.nounIn photography, the distance in front of and behind the subject that appears to be in focus.