membership
US /ˈmem.bɚ.ʃɪp/
UK /ˈmem.bɚ.ʃɪp/

1.
the state of belonging to or being a part of a group or an organization
:
•
We offer various types of membership to suit your needs.
•
Her membership in the club expired last month.
2.
the total number of members in a group or organization
:
•
The club's membership has grown significantly this year.
•
We need to increase our membership to stay viable.