abruptionPronunciation: /əˈbrʌpʃ(ə)n/Definition of abruption noun [mass noun] technical the sudden breaking away of a portion from a mass. (also placental abruption) Medicine separation of the placenta from the wall of the womb during pregnancy, especially when it occurs prematurely. Origin: early 17th century: from Latin abruptio(n)-, from abrumpere 'break off' (see abrupt)abruption in other Oxford dictionaries Definition of abruption in the US English dictionary