frame of reference (def 2).
A basis of a four-dimensional coordinate system in which the first coordinate is understood as a time coordinate, while the other three coordinates represent spatial dimensions. Inertial frames and non-inertial frames are both examples of reference frames. Also called frame of reference. See also General Relativity, space-time, Special Relativity.
noun, Sociology. 1. a group with which an individual identifies and whose values the individual accepts as guiding principles. noun in sociology, a group with which one identifies and shares attitudes, beliefs, or ideals; also, a group which a person hopes to join
noun 1. Surveying. a permanent mark set at a specific distance in a specific direction from a survey station so as to permit accurate reestablishment of the station. 2. any of various written or printed symbols, as an asterisk (*), dagger (†), or superscript number, used to indicate the presence of further information in a […]
- Reference values
reference values ref·er·ence values (rěf’ər-əns, rěf’rəns) pl.n. A set of laboratory test values obtained from an individual or from a group in a defined state of health.
- Reference works
reference works definition Books and other works that contain useful facts and information, such as dictionaries, encyclopedias, and bibliographies.