签订 qiāndìng to agree to and sign (a treaty etc)
How to remember 签订: 签 to sign + 订 make an order = to agree to and sign (a treaty etc).
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How it is used
- To conclude and sign (a formal agreement) - 签订合同 (qiāndìng hétong) sign a contract; 签订协议 sign an agreement.
- Specifically for treaties, contracts, agreements between parties. It bundles 'agree to + sign'; you don't 签订 an autograph. Formal business/legal register.