formality

/F AO0 R M AE1 L AH0 T IY0/
noun
  1. 1

    The state of being formal.

  2. 2

    Something said or done as a matter of form.

  3. 3

    A customary ritual without new or unique meaning.

  4. 4

    (countable) A specific requirement for obtaining a legal status, conducting a transaction, etc.

Source: https://en.wiktionary.org/wiki/formality