How to say "formation" in Japanese

Choosing the right word
  • 形成けいせいJLPT N1approx.Common
    noun, suru verb, transitive verbFormation as a gradual process of shaping or developing something — character formation, habit formation — where the emphasis is on something taking form over time rather than on a finished arrangement.
    世界せかいの熱帯雨林ねったいうりんは、この惑星わくせい上じょうの生命せいめいが形成けいせいする生態学せいたいがく的てきな連鎖れんさの中なかで、かけがえのない環かんをなしているのである。↗
    The world's tropical rainforests are critical links in the ecological chain of life on the planet.
  • 成立せいりつJLPT N2approx.Common
    noun, suru verb, intransitive verbFormation as coming into existence or establishment: the moment an agreement, cabinet, or plan materializes, rather than any ongoing process of shaping.
  • 構成こうせいJLPT N3approx.Common
    noun, suru verb, transitive verbFormation as the makeup or composition of something — the way its parts are put together into a whole. It points to the resulting structure rather than to any act of forming it.
    我々われわれのヨットクラブは10人にんのメンバーで構成こうせいされている。↗
    Our yacht club has ten members.
  • 組織そしきJLPT N3approx.Common
    noun, suru verb, transitive verb, intransitive verbBasically 'organization': as 'formation' it fits the forming of a group or association from people or elements; for the shaping, coming-into-existence, or makeup senses it is seldom the word you want.
    An executive council was formed to discuss the new proposal.
  • 編成へんせいCommon
    noun, suru verb, transitive verbFormation as a deliberately arranged whole: members or units organized into a set structure. It stresses the arranging itself — how a group is composed and staffed — rather than what the group then does.
    この列車れっしゃは七なな両りょう編成へんせいです。↗
    This train is made up of seven cars.

For 'formation', use 形成 for a process of taking shape, 成立 for something coming into existence, 構成 for the makeup of a whole, 組織 for organizing a group, and 編成 for arranging members into a structured body.

Usage comparisons are AI-assisted and cross-checked by multiple models; for study reference only

Japanese equivalents
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JLPT vocabulary levels are community estimates, not official (no official lists have been published since the 2010 revision).

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