In politics

• Electoral district
  Electoral district
  An electoral district is a distinct territorial subdivision for holding a separate election for one or more seats in a legislative body...
  
   or constituency
• Constituent (politics), an individual voter within an electoral constituency
• Interest group or constituency
• Constituent assembly
  Constituent assembly
  A constituent assembly is a body composed for the purpose of drafting or adopting a constitution...
  
  
• entity forming part of a sovereign state:
  • Constituent state
    Constituent state
    A constituent state, constituent entity, or constituent part, is a territorial and constitutional entity forming part of a sovereign state...
    
    
  • Constituent country
    Constituent country
    Constituent country is a phrase sometimes used in contexts in which a country makes up a part of a larger entity. The term constituent country does not have any defined legal meaning, and is used simply to refer to a country which is a part Constituent country is a phrase sometimes used in contexts...
    
    
• Constituency (administrative division)
  Constituency (administrative division)
  Constituency is used as a term for an administrative division in Namibia and the Canton of St. Gallen in Switzerland....
  
  , in Namibia and the Canton of St. Gallen in Switzerland.

In the physical sciences

• Constituent quark
  Constituent quark
  A constituent quark is a current quark with a covering.In the low energy limit of QCD, a description by means of perturbation theory is not possible. Here, no Asymptotic freedom exists, but the interactions between valence quarks and sea quarks gain strongly on significance...
  
   is a current quark with a covering
• Particle is a small localized object to which can be ascribed several physical properties such as volume or mass.