成員(せいいん)

せいいん
noun
member; constituent
1. member; constituent
A person who belongs to and forms part of a group, organization, or society. More formal and academic than everyday words for 'member.'
家族(かぞく)の成員(せいいん)それぞれに役割(やくわり)がある。
Each member of the family has a role.
社会(しゃかい)の成員(せいいん)として責任(せきにん)を果(は)たす。
To fulfill one's responsibility as a member of society.
組織(そしき)の成員(せいいん)が増(ふ)えるにつれて意思(いし)決定(けってい)が難(むずか)しくなる。
As the number of members in the organization grows, decision-making becomes more difficult.

A formal, somewhat academic term for a member or constituent of a group. Most commonly encountered in sociology, political science, and formal writing. Unlike 会員(かいいん), which implies formal enrollment, 成員(せいいん) emphasizes being a constituent part of a collective.

COMMON COLLOCATIONS:

  • 社会(しゃかい)の成員(せいいん): member of society
  • 家族(かぞく)の成員(せいいん): family member
  • 組織(そしき)の成員(せいいん): member of an organization
  • 集団(しゅうだん)の成員(せいいん): member of a group

SIMILAR WORDS:

  • メンバー: member — casual loanword used in everyday speech
  • 会員(かいいん): member — implies formal registration or membership (in a club, association, etc.)
  • 構成員(こうせいいん): constituent member — more technical, emphasizes the structural role within an organization
  • 一員(いちいん): one member (of) — emphasizes being part of a larger whole
general
Added 2026.4.29 22:32
26000/26097_seiin