〜に則って・〜に則った
in accordance with (rules, tradition)
Noun (ルール, 伝統, 法) + に則って / に則った + Noun
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に則って (にのっとって) means "in accordance with, following" an established standard: 大会は国際ルールに則って行われる, "the competition is held under international rules".
The noun is a formal norm: ルール, 法, 伝統, しきたり ("custom"), 契約, 手続き. It's common for ceremonies, sports, law and business. Before a noun, it becomes に則った: 古来のしきたりに則った結婚式, "a wedding held according to ancient custom".
It's close to に従って and に基づいて. Compared with に即して, it's about following a set rule, while に即して is about fitting reality.
Careful with the reading: のっとって, not のって. に乗って means "riding on".
Examples
大会は国際ルールに則って行われる。
The competition is held under international rules.
伝統に則って、儀式が行われた。
The ceremony was carried out according to tradition.
法に則って、適切に処理する。
We'll handle it properly, in accordance with the law.
契約に則って、支払いを行う。
Payment will be made in accordance with the contract.
二人は古来のしきたりに則った結婚式を挙げた。
The couple held a wedding according to ancient custom.