n.

1. 拘泥形式，拘謹[U][S1]
   I wish we could treat each other without formality.

   我真希望我們彼此之間不要太拘謹。

2. 正式手續[P1]
   It's a formality that we have to go through.

   這是我們必須辦理的手續。

3. 禮節；俗套[C]
   All formalities were observed at the ceremony.

   慶典儀式遵循了所有的禮節。

n.

▸something done or happening as a matter of course:

promotion looks a formality.