adjective
COLLOCATIONS FROM OTHER ENTRIES
optional extras (= something that you can choose to have or not )
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Tinted windows and a sunroof are optional extras .
COLLOCATIONS FROM CORPUS
■ NOUN
extra
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Most of the systems offer optional extras .
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Theories are not optional extras in science.
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Cruising chutes and Windsurfers are available as optional extras on some yachts.
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Made to measure in glass fibre with toughened glass roof and sides, optional extras include ventilation and double glazing.
EXAMPLES FROM OTHER ENTRIES
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Attendance at the meeting is optional .
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General Studies is optional for sixth-form students.
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The holiday price includes entertainment in the evenings, and there are optional excursions on offer every day.
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You don't have to do French - it's optional .
EXAMPLES FROM CORPUS
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All freshmen who attend optional orientation sessions receive information on date rape.
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At the same time optional accessories, such as cornices, light pelmets and plinths, could also be changed.
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If they wish, students can do an optional dissertation, and pick up word-processing and other computer skills.