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facultative

see definition of facultative
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Synonyms for facultative

adj optional
  • discretional
  • discretionary
  • elective
  • noncompulsory
  • nonobligatory
  • not required
  • volitional
  • voluntary

enabling

adjective. allowing to happen
Roget's 21st Century Thesaurus, Third Edition Copyright © 2013 by the Philip Lief Group.