English word formality comes from Middle French (ca. 1400-1600) formalité

Detailed word origin of formality

Dictionary entry	Language	Definition
formalité	Middle French (ca. 1400-1600) (frm)
formality	English (eng)	(countable) A specific requirement for obtaining a legal status, conducting a transaction, etc.. (uncountable) The state of being formal.. A customary ritual without new or unique meaning.. Something said or done as a matter of form.