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optional adjective

  /ˈɑp.ʃə.nəl/ , /ˈɒp.ʃə.nəl/
  • Not compulsory; left to personal choice; elective.
 facoltativo, opzionale, volontario, a discrezione, non obbligatorio

option noun

  /ˈɑpʃən/ , /ˈɒpʃən/
  • One of a set of choices that can be made. [from 19th c.]
 opzione

optionally adverb

  • In an optional manner; not mandatorily.
 opzionalmente
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