noun, noun or participle which takes 'suru', transitive verb, intransitive verb
conclusion; execution; entering into
Formal term for concluding or signing agreements, treaties, contracts, etc. Often used in legal, diplomatic, and business contexts.
両国は平和条約を締結した。
The two countries concluded a peace treaty.
契
Both parties' signatures are required for the execution of the contract.
noun, noun or participle which takes 'suru', transitive verb, intransitive verb
Technical or mechanical sense: tightening or fastening of joints, bolts, etc. Less common than the contractual sense.
ボルトの締結が不十分だと、振動で緩むことがある。
If the bolt fastening is insufficient, it may loosen due to vibration.