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  1. Oxford American Dictionary

    optional

    • IPA[ˈäpSHən(ə)l]

    美式

    • adj.
      available to be chosen but not obligatory
    • 釋義
    • 相關詞

    形容詞

    • 1. available to be chosen but not obligatory a wide range of optional excursions is offered

    optional extra

    • n.
      a non-essential additional item which is available for purchase.

    Oxford Dictionary

    • 更多解釋

    optional

    • IPA[ˈɒpʃən(ə)l]

    英式

    • adj.
      available to be chosen but not obligatory: a wide range of optional excursions is offered

    Oxford Dictionary