Polarisability
The tendency of a molecule or substance to become polarised under the influence of an external field.
Polarisation
(of light)
A beam of light can be polarised by passing it through a polarising material, e.g. a Nicol prism, which lets through only the parallel component of plane polarised light.
Polarisation
(of a bond)
An asymmetric distribution of valence electrons in a chemical bond gives rise to polarisation within the bond.
Polarisation
(of a molecule)
This is the modification of the distribution of the internal charges or electrons within molecule as a result of an external field.