optional in Italian
optional in Italian
facoltativo
Not compulsory; left to personal choice; elective.
opzionale
Not compulsory; left to personal choice; elective.
volontario
Not compulsory; left to personal choice; elective.
a discrezione
Not compulsory; left to personal choice; elective.
non obbligatorio
Not compulsory; left to personal choice; elective.