Relevance ranks synonyms and suggests the best matches based on how closely a synonym’s sense matches the sense you selected.
A-Z
Length
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Synonyms for nonobligatory
adj possible; available as choiceAntonyms for nonobligatory
Roget's 21st Century Thesaurus, Third Edition Copyright © 2013 by the
Philip Lief Group.
elective
adjective. able to be chosen
Roget's 21st Century Thesaurus, Third Edition Copyright © 2013 by the
Philip Lief Group.