membership

noun

1. the state of being a member, as of a society or club.
2. the status of a member.
3. the total number of members belonging to an organization, society, etc.

noun

1. the members of an organization collectively
2. the state of being a member

n.1640s, “state of being a member,” from member + -ship. Meaning “number of members” is from 1850.