How to say "fulfillment" in Japanese

• 成就じょうじゅCommon
  noun, noun (suffix), suru verb, transitive verb, intransitive verbFulfillment as realization: a goal, wish, or ambition actually coming true or being achieved. Think of a long-cherished plan or hope finally being brought to fruition.
  滑り出すべりだしが好調こうちょうなら事ことは半なかば成就じょうじゅしたのに等ひとしい。↗

  Well begun is half done.
• 履行りこうCommon
  noun, suru verb, transitive verbFulfillment of obligations: carrying out a promise, duty, or contract as one is bound to. This is the word for keeping an agreement or discharging what one owes.
  この契約けいやくは当事者とうじしゃ全部ぜんぶが履行りこうすべきものである。↗

  This agreement is binding on all parties.
• 実行じっこうJLPT N3approx.Common
  noun, suru verb, transitive verbStrictly about execution: carrying out a plan or putting something into practice. For most senses of 'fulfillment' this is only a marginal match, and it is seldom the word you want.
  私は彼かれの実行じっこう的てき能力のうりょくを信頼しんらいしている。↗

  I trust his executive ability.
• 完遂かんすいCommon
  noun, suru verb, transitive verbFulfillment as successful completion: seeing a task or undertaking through to the very end. Use it when the emphasis is on finishing what was started, not on the obligation itself.
• 貫徹かんてつCommon
  noun, suru verb, transitive verbFulfillment in the sense of attainment: a purpose or intention carried through to realization. For most senses of 'fulfillment' it is a marginal choice, closer to 'carrying through' than to fulfillment itself.
  初志しょしを貫徹かんてつしたらどうですか。↗

  Why don't you carry out what you've set out to do?

Choose 成就 for a goal or wish being realized, 履行 for promises, duties and contracts, 完遂 for seeing a task through to completion, and treat 実行 and 貫徹 as marginal matches centered on execution and attainment.

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

• 成就じょうじゅfulfillment
• 履行りこうperformance (of a duty)
• 実行じっこうexecution (e.g. of a plan)
• 完遂かんすいsuccessful execution
• 貫徹かんてつaccomplishment
• フルフィルfulfilment
• フルフィルメントfulfilment (of an order)