1The formation or establishment of something — a system, organization, government, or law coming into existence.
新しい会社の成立には多くの手続きが必要だった。
Establishing the new company required a lot of procedures.
連立政権の成立が正式に発表された。
The formation of the coalition government was officially announced.
その法律は国会での審議を経て成立した。
That law came into effect after deliberation in the Diet.
2The conclusion of a negotiation or deal — an agreement being reached or a contract being finalized.
双方が譲歩したことで契約が成立した。
The contract was concluded after both sides made concessions.
商談は成立し、来月から取引が始まる。
The business deal was concluded, and transactions will begin next month.
3A theory or argument being logically valid or holding up.
その仮説は実験結果によって成立することが確認された。
The experimental results confirmed that the hypothesis holds up.
前提が誤っていれば、この議論は成立しない。
If the premise is wrong, this argument doesn't hold.