How is it unambiguous It seems like you re unaware of the other uses of the word constituency It wouldn t surprise me if the usage of constiuency to describe a group of constituents hasn t crept into Commonwealth English like it has in American English precisely because in Commonwealth English the word refers to electoral districts This isn t the case across the pond Dictionary com for instance gives these definitions for constituency The body of voters or the residents of a district represented by an elected legislator or official The district so represented A group of supporters or patrons A group served by an organization or institution a clientele The magazine changed its format to appeal to a broader constituency It seems like only the second definition refers to electoral districts By the first third and fourth definitions listed constituency could refer to something else that s deserving of an article