decollementPronunciation: /deɪˈkɒlmɔ̃/Definition of decollement noun [mass noun] Geology a process in which some strata become partly detached from those underneath and slide over them, causing folding and deformation. (also decollement zone) [count noun] a boundary separating deformed strata from underlying strata which are not similarly deformed. Origin: mid 19th century: from French, from décoller 'unstick'
