'Rarefaction' definitions:
Definition of 'rarefaction'
noun
A decrease in the density of something; "a sound wave causes periodic rarefactions in its medium"
Definition of 'Rarefaction'
- Rarefaction \Rar`e*fac"tion\ (r[a^]r`[-e]*f[a^]k"sh[u^]n), n.
[Cf. F. rar['e]faction. See Rarefy.]
The act or process of rarefying; the state of being rarefied;
-- opposed to condensation; as, the rarefaction of air.
[1913 Webster]
