formality

Noun
  1. A requirement of etiquette or custom (synset 107469617)
    "a mere formality"
  2. A manner that strictly observes all forms and ceremonies (synset 104918597)
    "the formality of his voice made the others pay him close attention"
  3. Compliance with formal rules (synset 101206545)
    "courtroom formality"

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