允许 is a formal, transitive verb meaning 'to allow' or 'to permit' — granting official, institutional, or authoritative consent for an action. The character 允 (yǔn) means 'to assent' or 'to agree', while 许 (xǔ) means 'to permit' or 'to approve'; together, they reinforce the idea of giving explicit permission. It’s commonly used in regulations, rules, instructions, and formal speech — for example, in school policies, workplace guidelines, or government notices.

This word implies legitimacy and authority: the subject must have the power or right to grant permission (e.g., a teacher, manager, law, or system). It’s not used for casual personal preferences ('I’d like to…') but for situations where permission is formally required or restricted. Unlike more colloquial alternatives, 允许 carries a tone of seriousness and binding obligation — if something is not allowed, it’s typically prohibited, not merely discouraged.