optional

Definition:
1. Possible but not necessary; left to personal choice.
2. That you can choose to do or have if you want to.

Use 'optional' in a sentence:

1. Real-time Optional System for Vehicle Scheduling of Logistics Distribution.
2. Compliance with Practice Advisories is optional.
3. This is an optional step.
4. The Research of Problems of PE Optional Course in the General University.
5. It is optional with you.
6. These attributes are optional.
7. We have some optional subjects.
8. You took an optional course this semester, didn't you?
9. Establishing system of optional courses of sports in institutes and universities.
10. Study on the Practice and Theory of Piano Optional Course in Colleges.
11. Portrait mode is optional.
12. By setting Peking Opera as an optional course, students may have more freedom to decide whether to take it or not.
13. You may simply want to indicate that the fragment is optional.
14. The Smoothing and Optional Adaptive Enhancing Algorithm Applied to Nuclear Medical Image.
15. The Innovation and Practice of Optional Course of Modern Educational Technology.
16. This is an optional feature.
17. As a senior next year, I think extra periods should be used to take optional subjects.
18. Schools in our city provide a variety of optional classes to cater to students of different levels.
19. Actions and predicate are optional.
20. Our attendance at graduation is optional.
21. Others believe that going to classes should be optional for students.
22. Change to true in order to install an optional feature.
23. Speak. This step is optional.
24. Chinese is our optional course to us students of science.
25. Analysis on the Optional Situation of Accounting Policy for Listed companies in China.
26. Other templates are optional.
27. Is that optional course as hard as everybody says?
28. Connection groups are optional.
29. If you see humor as an optional form of entertainment, you're missing some of its biggest benefits: humor makes average-looking people look cute and uninteresting people seem entertaining.
30. This is an optional parameter.
31. According to Professor Johnson, we don't have to read the book if we don't want to, as it is optional.
32. An Optional Model of Portfolio Investment with Fuzzy-Coefficient.
33. Metallic paint is an optional extra.
34. However, this part is also optional.
35. Different templates take a different number of optional parameters.
36. Electrical control has applied famous brand ( optional) parts.
37. Inwrap device was one of the optional equipments.
38. The offline window is optional.
39. Taking optional subjects will enrich our mind.
40. The course consists of ten core modules and five optional modules.
41. It'should include sex of emulative, optional choose, history inheritance and but representative.
42. Special lighting and climate control are optional, since "I Am" is immaterial …
43. An optional proxy host name.
44. This step is actually optional.
45. This element is optional.
46. Somewhere along the line, holiday tipping went from an optional thank-you for a year of services to a Mafia-style protection racket.
47. A holiday isn't an optional extra. In this stressful, frantic world it's a must.
48. It is said that in England death is pressing, in Canada inevitable and in California optional.
49. Prospective analysis of sustainable development of optional sports teaching in universities.
50. In the new curriculum, some courses are compulsory, while others are optional for middle school students.
51. Other bath accessories, such as a loofah sponge, or bath gels, or potpourri, are very optional.
52. Optional extras include cooking classes at a top restaurant.
53. We also recommend a full day optional excursion to the Upper Douro.
54. There is a tour guide throughout the trip who will organize optional dinners and sightseeing.
55. Sex education is a sensitive area for some parents, and thus it should remain optional.
56. Certain courses are compulsory, others are optional.
57. This model comes with a number of optional extras.
58. Optional extras include cooking tuition at a top restaurant.