initiation fee; admission fee
入会金は初回のみ必要です。
The initiation fee is required only the first time.
このジムの入会金は三万円だと聞いた。
I heard the initiation fee for this gym is thirty thousand yen.
入会金が免除されるキャンペーン期間中に手続きを済ませた。
I completed the registration during the campaign when the initiation fee was waived.