optional


op·tion·al

adjective \ˈäp-shnəl, -shə-nəl\

: available as a choice but not required

Full Definition of OPTIONAL

:  involving an option :  not compulsory
op·tion·al·i·ty \ˌäp-shə-ˈna-lə-tē\ noun
op·tion·al·ly adverb

Examples of OPTIONAL

  1. Jackets are required at the restaurant, but ties are optional.
  2. Many optional features are available on this car.
  3. Registration is optional, not mandatory.

First Known Use of OPTIONAL

1765

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