Русско-англо-русский юридический словарь

An electoral district (also known as a constituency, riding, ward, division, electoral area or electorate) is a distinct territorial subdivision for holding a separate election for one or more seats in a legislative body. Generally, only voters who reside within the geographical bounds of an electoral district (constituents) are permitted to vote in an election held there. (Wikipedia)

In the Seventies, as a Labour backbench MP, I worked to get a public sector order for a major employer in my constituency. The civil servant in charge of the procurement seemed unreasonably obstructive and even to be promoting a competing company’s cause. (Telegraph)

A member of parliament (MP) is the representative of the people who live in his/her constituency. In many countries with bicameral parliaments, this category includes specifically members of the lower house, as upper houses often have a different title. (Wikipedia)

An electoral district (also known as a constituency) is a whole or a part of a state’s territory or a territorial subdivision, in which voters choose their representatives in elections for specified posts (eg president) or in order to act in specified functions (eg to represent a given group—parliamentary or local elections). (Oxford Constitutional Law)