constituent

An artifact that is one of the individual parts of which a composite entity is made up; especially a part that can be separated from or attached to a system.

“a component or constituent element of a system”

An abstract part of something.

“two constituents of a musical composition are melody and harmony”

Something determined in relation to something that includes it.

“the animal constituent of plankton”

(grammar) a word or phrase or clause forming part of a larger grammatical construction.

A member of a constituency; a citizen who is represented in a government by officials for whom he or she votes.

“needs continued support by constituents to be re-elected”

Constitutional in the structure of something (especially your physical makeup).