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optional

Pronunciation: /ˈɒp.ʃə.nəl/

The English word “optional” has 3 meanings listed here.

adjective

  1. Not compulsory; left to personal choice; elective.

noun

  1. Something that is not compulsory, especially part of an academic course.
  2. In various programming languages, a kind of variable that is assigned a specific data type but may or may not hold an actual value.

Etymology

From option + -al.

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Definitions are from Wiktionary, extracted by Kaikki.org, and are available under the CC BY-SA 4.0 licence.