adjective left to one's choice; not required or mandatory. Formal dress is optional. Synonyms: voluntary, elective, discretional leaving something to choice.
Define optional. optional synonyms, optional pronunciation, optional translation, English dictionary definition of optional. adj. Left to choice; not compulsory or automatic. op′tion·al·ly adv. American Heritage® Dictionary of the English Language, Fifth Edition.
Definition of optional adjective in Oxford Advanced Learner's Dictionary. Meaning, pronunciation, picture, example sentences, grammar, usage notes, synonyms and more.
leaving something to choice. op′tion•al′i•ty, n. 1. . discretional, elective, voluntary. op•tion /ˈɑpʃən/ n. the power or right of choosing:[uncountable] to have no option but to stay. choice:[countable] Your options are law school or taking a job.
From Longman Business Dictionary op‧tion‧al /ˈɒpʃənəlˈɑːp-/ adjective 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).
Jackets are required at the restaurant, but ties are optional. Many optional features are available on this car. Registration is optional, not mandatory.
