准许 is a formal, transitive verb meaning 'to permit' or 'to allow', typically used in official, administrative, or institutional contexts. It combines 准 (zhǔn), meaning 'to approve' or 'to authorize', and 许 (xǔ), meaning 'to permit' or 'to consent'. Together, they reinforce the sense of official sanction — not casual allowance, but a deliberate, often documented, granting of permission. You’ll commonly see it in regulations, school policies, government notices, or workplace guidelines.

The word implies authority: the subject must have the power to grant permission (e.g., a teacher, supervisor, or regulatory body), and the object is usually an action, person, or thing being permitted. It’s more formal than 允许 and stronger than 可以; using 准许 suggests procedural legitimacy rather than mere possibility or personal willingness. It rarely appears in casual speech among friends or family — there, you’d use 更好 or 就可以了 instead.