Definitions of member:

• noun:   an organization that is a member of another organization (especially a state that belongs to a group of nations)

  Example: "The library was a member of the interlibrary loan association"

• noun:   one of the persons who compose a social group (especially individuals who have joined and participates in a group organization)

  Example: "Only members will be admitted"

• noun:   anything that belongs to a set or class

  Example: "Snakes are members of the class Reptilia"

• noun:   the male organ of copulation (`member' is a euphemism)
• noun:   an external body part that projects from the body