1.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;
spare components for cars
2.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
3.(grammar) a word or phrase or clause forming part of a larger grammatical construction
4.an abstract part of something;
jealousy was a component of his character
5.constitutional in the structure of something (especially your physical makeup)