What are the antonyms for COMPULSORY?

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Synonyms for COMPULSORY

Usage Examples for COMPULSORY

  1. I should say the common school system is not as thorough as in Germany, where education is wholly compulsory. - "A Journey Through France in War Time" by Joseph G. Butler, Jr.
  2. Statement by the home teacher working among these peasants: There ought to be schools to teach English to the parents at which their attendance would be compulsory. - "A Stake in the Land" by Peter Alexander Speek