the sum of all the relative atomic masses of the atoms in a molecule; the ratio of the average mass per molecule of a specified isotopic composition of a substance to one-twelfth the mass of an atom of carbon-12 Mr, r.m.m. Former name molecular weight
relative molecular mass
See molecular weight.
[rel-uh-tiv-nis] /ˈrɛl ə tɪv nɪs/ noun 1. the state or fact of being relative.
- Relative pathname
file system A path relative to the working directory. Its first character can be anything but the pathname separator. (1996-11-21)
- Relative permeability
noun 1. the ratio of the permeability of a medium to that of free space μr
noun, Music. 1. the pitch of a tone as determined by its relationship to other tones in a scale. 2. the ability to identify or sing a tone by mentally determining the distance of its pitch from that of a tone already sounded.