同意 (tóng yì) means to agree, consent, or approve. 同 means same or together and 意 means intention or meaning, so the compound suggests sharing the same intention. It is used for agreeing with opinions (同意你的意见, agree with your opinion), consenting to proposals (同意这个方案, agree to the plan), or granting permission (父母同意, parents consented). The opposite is 反对 (fǎn duì, to oppose).