Definition of "Constituent" :

noun: 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."

noun: an abstract part of something

"Two constituents of a musical composition are melody and harmony."

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

noun: 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."

noun: something determined in relation to something that includes it

"The animal constituent of plankton."

adjective: constitutional in the structure of something (especially your physical makeup)