Formality
来自Big Physics
mid 16th century (in the sense ‘accordance with legal rules or conventions’): from French formalité or medieval Latin formalitas, from formalis (see formal).
wiktionary
From Middle French formalité. equivalent to formal + -ity.
etymonline
formality (n.)
1530s, "agreement as to form," from formal + -ity or else from French formalité (15c.) or Latin formitalitatem. Sense of "conformity to established rule" is from 1590s; meaning "something done for the sake of form" is from 1640s. Related: Formalities.
