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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31. The four-speed automatic in the test car is optional.
32. No, sorry, massager is an optional extra.
33. You don't have to do French - it's optional.
34. An optional extra is a rainfall monitor.
35. Reading is not an optional extra.
36. An optional helicopter ride down the canyon can be arranged for you by your escort.
37. All freshmen who attend optional orientation sessions receive information on date rape.
38. Each sample of script collected begins with an optional header.
39. Made to measure in glass fibre with toughened glass roof and sides[sentencedict.com/optional.html], optional extras include ventilation and double glazing.
40. Excursions During the summer season we will be organising a programme of varied optional day and half day excursions most weeks.
41. In addition there is a choice of two optional subjects from the following list: Climatology.
42. Yamaha is also offering an optional factory-fitted alarm and a U-lock to fill that space under the seat.
43. In the afternoon there is an optional excursion along the shores of Lake Como returning by boat.
44. A choice of optional units is also available from other relevant subject areas.
45. An optional gateway function to other terminals and personal computers is included, as is a printing function.
46. A better bet for performance is the smaller 190, with the optional 2.5-litre diesel instead of the usual 2-litre version.
47. Optional dives are performed in the quarterfinal, followed by required dives in the semifinal and optionals again in the final.
48. Optional accessories include a car battery adaptor, car stereo cassette adaptor and car mount kit.
49. Halfon is trying to introduce his 72-pound fiberglass board -- with an optional sail -- in much the same way.
50. Say goodbye by joining in an optional evening's excursion and enjoying traditional folk dancing and singing.
51. This can be fitted with push release toggle as an optional extra.
52. Optional trimmings For a gathered frill: lace or double-sided satin ribbon, measuring twice the perimeter of the cushion.
53. Students take three compulsory core units and four optional units in each academic year.
54. If they wish, students can do an optional dissertation, and pick up word-processing and other computer skills.
55. There are numerous good restaurants in Zakopane and similarly in the places where we travel for optional excursions.
56. Anticipations and extensions are optional components of prolongation regions; when either exists they are weak components relative to the arrival.
57. Atheism for Marxism is not an optional extra or a mere facet but the very essence of it.
58. The following information specifies all the keywords of a module header, and the required and optional user-supplied information.
59. Less impressive is the performance of the optional automatic transmission.
60. The optional BillLimit feature enables customers to budget by setting a monthly limit.
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.