formal permission

noun
UK /ˈfɔː.məl pəˈmɪʃ.ən/
US /ˈfɔːr.məl pərˈmɪʃ.ən/

Official approval you get from someone in charge.

You need formal permission from the school before you can use the gym.


OTHER MEANINGS

2. Written or documented consent required by rules or law.

The company obtained formal permission to build the new factory.

3. A parent's signed agreement for a child to take part in an activity.

The teacher collected formal permission slips for the field trip.

4. Official leave granted to do something normally restricted.

Researchers received formal permission to study the protected animals.