Member, Membership
noun
If you meet enough members you will become a member yourself!
かいいん
This is a jukugo word that uses the on'yomi readings of the kanji. You should be able to read this on your own.
まずは図書館の会員になったらどうですか？
First of all, why don't you become a member of the library?
田中さんはスポーツジムの会員です。
Mr. Tanaka is a member of a gym.
会員カードはお持ちですか。
Do you have a membership card?