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op·tion·al

optional

 
 
pronunciation:
ap sh nl
features:
Word Combinations (adjective)
part of speech: adjective
definition: left to someone's choice; not required.
Sports are optional at my school.
antonyms:
compulsory, imperative, required
similar words:
alternative, voluntary
Word CombinationsSubscriber feature About this feature
derivation: optionally (adv.)