noun
member; regular member; active member
Refers to a person who belongs to a group, organization, or society, often with full or regular status. Slightly formal.
彼はクラブの成員です。
He is a member of the club.
新しく成員を募集しています。
We are recruiting new members.
会員 is more common for membership in clubs, associations, or subscription services, while 成員 is broader and slightly more formal, often used for groups like teams or societies.
メンバー is a casual loanword used in everyday conversation; 成員 is more formal and often appears in written or official contexts.
Compound of 成 (sei, 'become, form') and 員 (in, 'member, personnel'), literally 'forming member'. The spelling 正員 uses 正 (sei, 'correct, regular') to emphasize regular or full membership, but this form is rare.