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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
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.
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