Definitions from Wiktionary (optional)

▸ adjective:  Not compulsory; left to personal choice; elective.
▸ noun:  Something that is not compulsory, especially part of an academic course.
▸ noun:  (programming, sometimes capitalized) In various programming languages, a kind of variable that is assigned a specific data type but may or may not hold an actual value.
▸ Also see optional

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