optional
English Thesaurus
1. possible but not necessary; left to personal choice (adj.all)
| similar | : | elective, |
| definition | : | not compulsory (adj.all) |
| similar | : | ex gratia, |
| definition | : | as a favor; not compelled by legal right (adj.all) |
| similar | : | facultative, |
| definition | : | not compulsory (adj.all) |
| similar | : | nonmandatory, nonobligatory, |
| definition | : | not required by rule or law (adj.all) |
| antonym | : | obligatory, |
| definition | : | morally or legally constraining or binding (adj.all) |
| antonym | : | obligatory, |
| definition | : | morally or legally constraining or binding (adj.all) |
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