WEBthe act or process of changing an area of a town by replacing old buildings, roads, etc. with new ones: Total cost of the proposed redevelopments is not yet known. 拟议重建的总成本尚不得而知。. perestroika uk / ˌper.əˈstrɔɪ.kə/ us / ˌper.əˈstrɔɪ.kə/ noun. the political, social, and economic changes that happened in the ...