overexpansion Syllabification: (o·ver·ex·pan·sion)Pronunciation: /ˌōvərikˈspanSHən/Entry from US DictionaryDefinition of overexpansion noun rapid or uncontrolled expansion that produces undesirable effects:the explosive overexpansion of the telecommunications industryoverexpansion in other Oxford dictionaries Definition of overexpansion in the US English dictionary