noun (plural formalities) the rigid observance of rules of convention or etiquette: (usually formalities) a thing that is done simply to comply with requirements of etiquette, regulations, or custom:
ー オックスフォード英英辞典より引用
例文
You have to go through the legal formalities to go to court.
訴訟を起こすためには、法律上の正式手続きを踏まなければならない。
Excuse me, which floor can I ask for the formality of registration?