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[U] the state of belonging to an organizationYou have to apply for membership UK of/US in the sports club.
a membership fee/card
Annual membership (= the amount you have to pay to join a particular organization for one year) is £25.
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[C + singular or plural verb] all the people who belong to an organizationOur membership is/are divided on the issue.
The society has a very large membership (= number of members).