单词	optional
释义	optional adjective op·​tion·​al ˈäp-sh(ə-)nəl  : involving an option : not compulsory optionality ˌäp-shə-ˈna-lə-tē  noun optionally adverb Synonyms discretionary elective voluntary See all Synonyms & Antonyms Example Sentences Jackets are required at the restaurant, but ties are optional. Many optional features are available on this car. Registration is optional, not mandatory. Recent Examples on the Web New York City’s subway and bus system decided to make mask wearing optional, and free masks will still be available at subway station booths and on commuter railroad trains. Los Angeles Times, 14 Sep. 2022 Most public schools plan to keep masks optional this fall. Jacqueline Howard, CNN, 6 Sep. 2022 Serving in a silver julep cup is fun, but optional. Anna Luisa Rodriguez, Washington Post, 17 Aug. 2022 Power folding second- and third-row seat are optional or standard, depending on trim. Rachel Rothman, Good Housekeeping, 17 Aug. 2022 In Towson, Apple continued the practice, but changed the meetings from mandatory to optional, which would technically comply with the law. Wired, 29 July 2022 The top speed, with the optional 19- or 20-inch wheels, is 165 mph. Michael Harley, Robb Report, 6 July 2022 This week, New York City finally made masks optional for children ages two to four in preschools or daycare facilities. Michael Brendan Dougherty, National Review, 15 June 2022 Many other universities and colleges across Illinois began the semester with face coverings being optional in most indoor areas. Angie Leventis Lourgos, Chicago Tribune, 1 Sep. 2022 See More Word History First Known Use 1765, in the meaning defined above Kids Definition optional adjective op·​tion·​al ˈäp-shə-nᵊl  : left to choice : not required Costumes are optional at the party. optional adjective as in voluntary subject to one's freedom of choice at the resort all recreational activities are optional, and you may choose to participate in none of them Synonyms & Similar Words Relevance voluntary elective discretionary alternative chosen unnecessary alternate unwanted dispensable unneeded Antonyms & Near Antonyms mandatory compulsory required obligatory necessary essential requisite indispensable nonvoluntary nonelective See More
随便看	terribler terriblest terriblier terribliest terribly Terricolae terricole terricoles terricoline terricolous terrier terriers terries terriest terrietiae terrietias terrific terrifically terrificly terrified terrifiers terrifies terrify terrifying terrifyingly

英语词典包含469781条英英释义在线翻译词条，基本涵盖了全部常用单词的英英翻译及用法，是英语学习的有利工具。