The word 'proscribe' is often used in official, legal, or political contexts to refer to banning actions. The legislation proscribed the sale of certain weapons.
Pro Tip 2/3
Absolute Ban
'Proscribe' implies a complete and authoritative ban, usually enacted by someone in power. The council proscribed the use of fireworks within city limits.
Pro Tip 3/3
Seriousness
'Proscribe' conveys a serious prohibition with potential consequences if defied. The institute proscribed plagiarizing in any form.