Full Idea
Mereological supervenience is the doctrine that wholes are fixed by the properties and relations that characterise their parts.
Gist of Idea
Mereological supervenience says wholes are fixed by parts
Source
Jaegwon Kim (Mind in a Physical World [1998], §1 p.018)
Book Reference
Kim,Jaegwon: 'Mind in the Physical World' [MIT 2000], p.18
A Reaction
Presumably this would be the opposite of 'holism'. Personally I would take mereological supervenience to be not merely correct, but to be metaphysically necessary. Don't ask me to prove it, of course.