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TOEFL IELTS BNC: 5815 COCA: 5692

optional

Word family 
op·tion·al /ˈɒpʃənəl $ ˈɑːp-/ ●●○ AWL adjectiveadj  
MUSTif something is optional, you do not have to do it or use it, but you can choose to if you want to 可选择的，非强制的 OPP compulsory
 three optional courses
三门选修课
 The other excursions are optional.
其他的短途旅行是自选项目。
optional extra British EnglishBrE
 Leather seats are an optional extra.
皮座椅是可选配件。
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In everyday English, people often say that you don’t have to do something rather than say it is optional: 在日常英语中，人们一般说don’t have to do sth，而不说optional
Ties are optional. → You don’t have to wear a tie. 领带不是非系不可。
Examples from the Corpus
optional• Attendance at the meeting is optional.• You don't have to do French - it's optional.• At the same time optional accessories, such as cornices, light pelmets and plinths, could also be changed.• If they wish, students can do an optional dissertation, and pick up word-processing and other computer skills.• The holiday price includes entertainment in the evenings, and there are optional excursions on offer every day.• General Studies is optional for sixth-form students.• All freshmen who attend optional orientation sessions receive information on date rape.
optional extra• Most of the systems offer optional extras.• No, sorry, massager is an optional extra.• Reading is not an optional extra.• This can be fitted with push release toggle as an optional extra.• Return flight back to U.K. or optional extra day in Stockholm, for sightseeing or a visit to a local woodworking group.• Etiquette and good manners are not a middle-class pastime or an optional extra for nice people.• An optional extra is a rainfall monitor.• Atheism for Marxism is not an optional extra or a mere facet but the very essence of it.
From Longman Business Dictionary
optionalop·tion·al /ˈɒpʃənəlˈɑːp-/ adjectiveadj
if something is optional, you can choose whether or not you have it, do it, or use it
You can have a 17-inch monitor as an optional extra (=something that is additional to or better than the basic type).
The use of a password to access the system is optional.
→ compare standard2
op·tion·al adjectiveadj →REGISTER1
Chinese
Syllable
Corpus
TOEFL IELTS BNC: 5815 COCA: 5692
optional

adjective

VERBS | ADVERB VERBS➤be可選擇▸➤make sth使⋯成為可選ADVERB➤entirely, purely完全自由選擇的◇The extra language classes are entirely optional.附加的語言課程是自由選修課。
TOEFL IELTS BNC: 5815 COCA: 5692
optional adj.
⇨ voluntary 1
TOEFL IELTS BNC: 5815 COCA: 5692
optional
Available and to be, or to become available: available, public, spare...

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