Constituent

01 a. Serving to form, compose, or make up; elemental; component.

1.
Serving to form, compose, or make up; elemental; component.
“Body, soul, and reason are the three parts necessarily constituent of a man.” — Dryden.
2.
Having the power of electing or appointing.
“A question of right arises between the constituent and representative body.” — Junius.

02 n. The person or thing which constitutes, determines, or constructs.

1.
The person or thing which constitutes, determines, or constructs.
“Their first composure and origination require a higher and nobler constituent than chance.” — Sir M. Hale
2.
That which constitutes or composes, as a part, or an essential part; a component; an element.
“We know how to bring these constituents together, and to cause them to form water.” — Tyndall.
3.
One for whom another acts; especially, one who is represented by another in a legislative assembly; -- correlative to representative.
“The electors in the district of a representative in Congress, or in the legislature of a State, are termed his constituents.” — Abbot.

“To appeal from the representatives to the constituents.” — Macaulay.
4.
A person who appoints another to act for him as attorney in fact.(Law)