optional
Translation
optional, voluntary
Examples
The final chapter is optional.
The final chapter is optional.
Insurance is optional but recommended.
Insurance is optional but recommended.
Grammar Patterns
(sth.) is optional (something) is not required. The final chapter is optional.
Similar Words
Synonyms: voluntary, discretionary; Antonyms: mandatory, compulsory, required
Etymology
From 'option' + '-al', an adjective-forming suffix. It means 'related to an option' or 'available as a choice'.
Memory Tips
If something is 'optional', you have the 'option' to do it or not.