The noun 规定 (guīdìng) means "regulation," "rule," or "provision." It can also be used as a verb meaning "to stipulate" or "to specify." It commonly appears in legal, institutional, or organizational contexts to describe established rules or requirements.
公司规定员工不能迟到。
gōngsī guīdìng yuángōng bù néng chídào.
The company requires that employees must not be late.
按照学校的规定,考试不能用手机。
ànzhào xuéxiào de guīdìng, kǎoshì bù néng yòng shǒujī.
According to the school's rules, phones cannot be used during exams.
新的交通规定下个月开始执行。
xīn de jiāotōng guīdìng xià gè yuè kāishǐ zhíxíng.
The new traffic regulations will take effect next month.