Meaning : Have as a part, be made up out of.
Example :
The list includes the names of many famous writers.
Meaning : Add as part of something else. Put in as part of a set, group, or category.
Example :
We must include this chemical element in the group.
Meaning : Allow participation in or the right to be part of. Permit to exercise the rights, functions, and responsibilities of.
Example :
Admit someone to the profession.
She was admitted to the New Jersey Bar.