plural memberships
Definition of membership
1
: the state or status of being a member
2
: the body of members
an organization with a large membership
3
mathematics
: the relation between an element of a set (see set entry 2 sense 21) or class and the set or class itself — compare inclusion sense 3a
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Merriam-Webster unabridged
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Time Traveler for membership
The first known use of membership was in 1614
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