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Elementary Dictionary
       

op·tion·al

optional

 
 
pronunciation:
ap sh nl
part of speech: adjective
definition: If something is optional, you can do it if you want to, but you don't have to do it. Or you can have something if you want to have it, but you don't have to have it. You can make your own decision about it.
The high school offers team sports after school, but playing is optional.Wearing the school uniform is not optional. Everyone has to wear it.
antonyms:
required
derivation: optionally (adv.)