optional

adjective

UK /ˈɒpʃ(ə)nəl/

1
something that is optional is available or possible if you want it, but you do not have to have it or do it
The price includes hotel and meals – entertainment is optional.
Add 200 grammes of walnuts (optional).
The history course is optional, but English is compulsory.
an optional extra (=something that is available, usually for more money):
Remote central locking comes as an optional extra.
Synonyms and related words
Available and to be, or to become available
available
public
spare

单词	optional
释义	optional adjective UK /ˈɒpʃ(ə)nəl/ DEFINITIONS1 1 something that is optional is available or possible if you want it, but you do not have to have it or do it The price includes hotel and meals – entertainment is optional. Add 200 grammes of walnuts (optional). The history course is optional, but English is compulsory. an optional extra (=something that is available, usually for more money): Remote central locking comes as an optional extra. Synonyms and related words Available and to be, or to become available available public spare derived word optionally adverb Synonyms and related words Available and to be, or to become available available public spare optional adjective US /ˈɑpʃən(ə)l/ DEFINITIONS1 1 something that is optional is available or possible if you want it, but you do not have to have it or do it The price includes hotel and meals – entertainment is optional. Add one cup of walnuts (optional). The history class is optional, but English is compulsory. an optional extra (=something that is available, usually for more money): Remote central locking comes as an optional extra. Synonyms and related words Available and to be, or to become available available public spare derived word optionally adverb Synonyms and related words Available and to be, or to become available available public spare
随便看	what’s your/his/her game? wheat wheatberry wheaten wheatgerm wheatgrass wheatish wheatmeal whee wheedle wheedling wheel wheel and deal wheel around wheel-away wheelbarrow wheelbase wheelchair wheel clamp wheeler-dealer wheelhouse wheelie wheelie bin wheel of fortune wheel out

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optional