Synonym: elective, voluntary. Antonym: compulsory. Similar words: exceptional, exceptionally, option, adoption, proportional representation, international relations, nationalization, rationalization. Meaning: ['ɑpʃənl /'ɒp-] 
adj. possible but not necessary; left to personal choice.
adj. possible but not necessary; left to personal choice. 
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1. The other excursions are optional.
2. I'm doing two optional modules.
3. Growing old is mandatory; growing up is optional.
4. The extra language classes are entirely optional.
5. Optional extras include cooking tuition at a top restaurant.
6. Optional extras include anti-lock brakes and an electric sunroof.
7. Leather seats are an optional extra.
8. Music is an optional extra at our school.
8. Sentencedict.com try its best to collect and build good sentences.
9. My phone came with 20 optional ringtones.
10. The goods are optional, but only one.
11. Tinted windows and a sunroof are optional extras .
12. Certain courses are compulsory, others are optional.
13. It is optional with you.
14. Students choose from optional subjects in addition to the core curriculum.
15. Is English an optional lesson, or does everyone have to learn it?
16. Formal dress is optional.
17. An optional 1 500 sheet feeder can be attached to the photocopier.
18. This model comes with a number of optional extras .
19. Cruising chutes are available as an optional extra.
20. A free holiday does not include optional insurance premium.
21. What optional extra security devices are available?
22. General Studies is optional for sixth-form students.
23. Most of the systems offer optional extras.
24. Attendance at the meeting is optional.
25. Theories are not optional extras in science.
26. It contains an optional listening component for the course.
27. The course consists of ten core modules and five optional modules.
28. English is compulsory for all students,(sentencedict.com) but art and music are optional.
29. Sex education is a sensitive area for some parents, and thus it should remain optional.
30. Seat-belts are included as standard but electric windows are an optional extra.
More similar words: exceptional, exceptionally, option, adoption, proportional representation, international relations, nationalization, rationalization, multinational corporation, constitutional convention, rational, national, emotional, rationally, fictional, educational, operational, additional, functional, positional, irrational, conditional, rationalize, rationality, irrationally, rationalism, nationalism, promotional, nationalize, vibrational.